An explosives tractor owned by the Gray & Houseman Construction Company fires several charges into a mountain. Inside the tractor, Eddie Houseman says this looks good. Cheng says the charges are cutting through completely in line with the survey. Eddie tells him to fire the remaining two charges. The charges are fired, and hit their targets. Eddie says they're through, bang on schedule. They'll get a good bonus for this.

Eddie decides they need to take a look at what they've done, so Chuck drives the tractor forwards towards the mountain. Chuck thinks they've made a pretty good job, but as soon as he says this, there's a rock fall. Eddie says to reverse back, so Chuck drives the tractor back out of the mountain. Rocks continue to fall from above.

Cheng thinks that was close. Eddie says they'll finish up here, then get back to base. Their base is a giant construction vehicle, which is slowly moving. As it does, it is laying down a road behind it.

Inside, staff keep a lookout for anything that's in the way. A cannon on the front of the vehicle is fired, which blows apart the debris. Eddie's group return in their tractor, and Chuck says that the construction vehicle has made good time. Eddie says they need to, if they're to make that completion date.

The front of the construction vehicle opens up, and Chuck drives the explosives tractor into it. Once the tractor stops, it is spun around on a turntable. Eddie heads in to see Bob, the project manager. Bob tells him he's done wonders, as he never thought he'd actually cut through the mountain before the monsoon.

Eddie tells him with any luck, they're going to make that date. Bob decides to drink to that, as Eddie says they must make it, as this is their first big contract. If they fall down on this one, they've had it. Bob says if they can get this road finished before the rains, they'll be ok. He tells Eddie to just go off and enjoy his vacation, and not to worry. He asks him if he's going anywhere special, and Eddie says he's going to look up an old friend.

At Tracy Island, Grandma Tracy presents Tin-Tin with a dress and says she did the best she could. They just need to think of a special occasion for her to wear it -or for a special person. Tin-Tin asks who she has in mind, and Grandma says young Alan Tracy is a mighty handsome boy. In the lounge, Gordon reports that an aircraft is approaching the island.

Jeff puts operation cover up into place. As the jet lands, Tin-Tin wonders who it could be. Scott just hopes whoever it is doesn't stay long. Jeff agrees, thinking it would be kind of awkward if they get an emergency call. Kyrano then brings Eddie Houseman in, and Tin-Tin knows who he is.

Later on, Alan is sullenly playing a few notes on the piano. Virgil asks Gordon where Tin-Tin has got to. Gordon reveals that this Prince Charming flew in and is really sweeping her off her feet. Virgil asks if this guy was as handsome as he is, and Gordon says nearly. Alan asks them to knock it off, and wonders what has gotten into everyone. It seems the only thing they're talking about it Eddie and Tin-Tin. He thinks the two are just friends, that's all.

Eddie and Tin-Tin are riding in a speedboat. Eddie tells Tin-Tin it's good to be with her again, and Tin-Tin says it has been a long time. They arrive back at the island, and Tin-Tin says it looks like Eddie's company will make a go of it. She's pleased for him, and Eddie says thanks. He says they'll go broke if they don't finish that road on time, but things have been going great up to now. He wishes she could see their outfit, as it really is great.

Back at the mountain, Bob tells Lester that according to the weather forecast, they're just going to make it. But Lester tells him to take a look at this, and presents him with a report. Their instruments are picking up earth tremors in the mountains. It's hard to tell how bad they are, as the signal is faint. Bob decides they'll have to take a look themselves, so he and Lester depart from the construction vehicle in a a helijet.

They fly towards the mountain, and see a rock fall. Lester says this looks bad, and Bob says that the monsoon will bring the whole range into the cutting they've made. He thinks they'll never finish the road on time now! They head back to the construction vehicle.

Kyrano sees his daughter, and says she looks beautiful. He thinks that Eddie seems a nice young man, and asks if she's going out again. Tin-Tin says she is, and Eddie is waiting for her downstairs.

But Eddie's jet takes off and departs from Tracy Island. Jeff explains to an upset Tin-Tin that Eddie had received some pretty bad news from the road camp. Tin-Tin thinks Eddie couldn't even wait to say goodbye. Jeff guesses Eddie's company must mean a great deal to him, but he'll write to her. As Tin-Tin leaves the room, Scott thinks this finishes Eddie, as far as Tin-Tin is concerned. Virgil just thinks they were lucky they didn't get a call whilst Eddie was here.

Eddie goes to see Bob, and finds out what's going on now. He says they can't give up now, but Bob says it's too late, as the rains have started. Eddie asks if they're just going to sit here and let a landslide ruin all their work to date. Bob says that's what they'll do, and then in the spring... Eddie stops him and says that if they wait until spring, they'll lose their contract! Bob says they'll have to try and get an extension, but Eddie says the only reason they got the contract is because they gave an early completion date. If they don't make the date they said they would, this company is nothing! Lester says there's no other way, but Eddie suggests to let him take a gang of men up there and carefully place some nutomic charges, they could blast the peak and make it fall away from the road instead of into it. Bob warns the seismograph shows that peak could collapse at any second. Even a small slide could cause the charges to explode when they're being placed. The two get into an argument over what to do, but Bob then says as he's the senior partner, they'll apply for the extension. Eddie says it'll break them, and whilst Bob says maybe, it means Eddie will be alive. He states that the decision has been made.

Back at Tracy Island, Alan goes to see Tin-Tin. He says he wants to go water skiing and asks if Tin-Tin would like to join him, but she declines. Alan says it was pretty mean of that Eddie walking out like that, which causes Tin-Tin to storm off. Alan wonders what he said, and Grandma says all the wrong things, as usual. Alan thinks he's no good at making fancy speeches, and wonders what to do. Things were swell before that Eddie came along, so what is he going to do? Grandma says to just leave things to her.

Eddie checks Bob is asleep, and then heads down to the front of the construction vehicle. There is a thunderstorm going on outside, which is causing a lot of noise. Eddie opens the door of the construction vehicle, and then gets into the explosives tractor. He starts it up and drives it out, saying here goes.

Inside the construction vehicle, an alarm suddenly goes off. Lester contacts Bob and says they're picking up an alarm signal, so the two go to the control room. Lester says there are severe tremors in the area of the cutting, and Bob is glad he didn't let Eddie go. But he then asks where Eddie is, and Lester says he hasn't seen him. Which is odd, as it isn't like Eddie to sleep through an alarm call. Bob worries Eddie has gone out there, and tells Lester to find him.

Eddie drives the explosives tractor up a cliff, and then stops. Back inside the construction vehicle, Chuck says the explosives tractor is missing, along with three cases of charges. Bob calls Eddie a fool, but tells everyone else to come on, as they can still stop him.

Eddie has gotten out of the tractor, and has set a harness up. He starts drilling into different parts of the rock, and starts placing charges down. Bob tries to contacts Eddie, but as the radio is inside the tractor, nobody is there to answer it. Lester says things are getting worse, and tells Bob to try again.

Bob uses the radio again, asking Eddie to call in. Eddie then does respond, and says he's planted the charges. Bob tells him to get out of there, as the peak is cracking up! There's going to be a landslide any minute. Eddie decides it'd be best to fire the charges now. Bob thinks he's too close, he needs to get away from there or he'll kill himself! But he then realizes that Eddie has cut off.

Bob and the others then see several explosions at the peak. The resulting debris moves the explosives tractor, and it ends up partly being off the cliff. Eddie gets thrown around inside it.

Bob tells Eddie he did it, and they can see from here that the cutting is in no danger now. Eddie tells Bob that the blast took his tractor right to the edge. He can't get out, as if he moves to the door, the thing will overbalance. Bob says they're on their way, but Eddie says there is worse to come. He still has a case of nutomic charges onboard. If this goes over the edge, he's going to be blown sky high!

Bob makes a call to International Rescue. John receives the call in Thunderbird 5, and tells them to go ahead. Bob says they need International Rescue's help. Back on the cliff, the explosives tractor nearly goes over.

Lester and Cheng have taken the helijet to get close to the peak. Lester asks what happened, and Eddie says he just tried to stretch his legs. Lester tells him to just stay uncomfortable, as he thought the tractor was going over that time. Eddie says that's what he thought. He asks what's going on, and Lester says Bob is trying to contact International Rescue.

Bob finishes explaining the situation to John. John tells him they're on their way, and then contacts Tracy Island. He explains that he told Bob they'd be there, and he hopes he's done this right. Jeff tells him of course he did, and asks what that's supposed to mean. John says he left the name of the guy to last: Eddie Houseman. Scott says Eddie knows them.

Jeff says that's right, so Alan asks if they can't help. Jeff says he's not saying that, but Scott says if they go through with this job, they'll break their cover. John asks if they are going to turn this call down, but Jeff says that don't turn down any call. They've done everything they can to hide their identity, but not at the risk of wasting a life. He tells Scott to carry on.

Scott heads down to Thunderbird 1, and takes off. Back at the peak, the group watch as a loose boulder comes close to smashing into the tractor. It misses, but the tractor moves further over the edge of the cliff.

Lester says any more of those and it'll be all over before International Rescue get here. Back at Tracy Island, Jeff tells Virgil to use the magnetic grabs, and Alan can help him with this one. Virgil and Alan head down to Thunderbird 2, and take off.

Lester tries to call International Rescue, but says he can't reach them. Bob says the weather is getting worse, and if International Rescue don't get here soon, they're going to have a wasted trip. Another group of smaller boulders then fall down. Bob is just glad Eddie can't see those rocks.

Grandma is sewing Tin-Tin's dress and mentions that Alan insisted on going on the rescue, even though he was very sick. She just hopes he can bear the pain. Tin-Tin asks if Mr Tracy let Alan go, and Grandma says he couldn't stop him. She asks not to mention this to anyone, as they're all worried as it is. Tin-Tin says she understands. Meanwhile, Scott arrives at the peak.

Lester tells Eddie that International Rescue have arrived. But Eddie thinks this one will be beyond even them. Scott radios the group and says it'll be a few more minutes until Thunderbird 2 gets here. But he's going to trying to do something about those boulders. Lester doesn't know what he can do, they were going to build a barrier, but they haven't got the necessary gear. Scott says they have, and he puts Thunderbird 1 into a dive.

He fires several poles into the peak, which catch any more boulders. Thunderbird 2 then arrives, and Scott says he's laid down a steel screen to stop any rocks from knocking the tractor over the edge. He tells Virgil and Alan to lower the grabs, and pick the tractor up.

Thunderbird 2 deploys the magnetic grabs from its pod, and then moves down towards the tractor. But as it does, its vertical jets are causing the tractor to tip over. Scott tells Virgil to pull away, and this stops the tractor from going over. Virgil asks what they can do, as they need to go in closer if they're going to make contact with the grabs. He asks if they could fix a line to hold the tractor steady, but Scott says that's not possible. The ground next to the tractor is so badly cracked that even a small increase in weight could tip that balance.

Scott then has an idea. He moves Thunderbird 1 close to the tractor, and comes to a stop just beneath it. He has Thunderbird 1's nosecone placed under the front of the tractor. He tells Virgil to come in now, as Thunderbird 1 will take the strain. Virgil moves Thunderbird 2 downwards, and thanks to Thunderbird 1, the tractor is no longer in danger of going over.

Alan activates the magnetic grabs, which grab onto the tractor. Scott moves Thunderbird 1 back, and Virgil turns Thunderbird 2 around. Thunderbird 2 starts to head away from the peak, but Alan says the tractor is too heavy for the grabs, they aren't going to hold it!

One of the grabs detaches from the tractor. Scott sees Eddie has gotten out of the tractor, and tells Virgil to hold Thunderbird 2 steady -Eddie is going to jump for it. Virgil moves Thunderbird 2 towards a cliff, and gets the tractor as close as he can to it.

Eddie jumps out of the tractor, and lands on the cliff. Scott says Eddie is clear, and tells Virgil to get the tractor to level ground so they can get to the nutomic charges. Virgil moves the tractor away from the cliff, but then another of the grabs falls away. Virgil says they're nearly there, but Alan says they can't hold it.

The other two grabs them come off, and the tractor falls. It hits the side of the peak and rolls over several times, and then explodes. Eddie walks over to the rest of the team, and Lester tells him he saved the road. Eddie says if you ask him, International Rescue did all the saving around here. He's sure looking forward to thanking those guys, but Bob tells him it doesn't look like he'll get the chance.

They see that International Rescue are already leaving. At Tracy Island, Gordon says the guys managed to pull off a rescue without even landing. Jeff says that with Eddie not seeing them, their secret is safe. Tin-Tin is glad they're alright, and asks if she can speak to Alan. Jeff tells her to go ahead. Tin-Tin asks Alan if he is alright, and Alan says he is now.

Tin-Tin says she was worried about him, and he shouldn't have taken such chances. Alan tells Tin-Tin that they can have a long talk about it once he gets back. Tin-Tin says she'll be waiting. At the call ends, Thunderbird 1 and Thunderbird 2 head back to base.