This has always been my favorite in the series.
The ship is doomed from the start, with a fault in the electrical system eventually causing a fire that wakes the boys up prematurely from their hypothermia sleep. Chris actually has to order them to abandon ship to drain the heat, which causes despair in Control when it looks like the ship has blown into pieces.
Tony shines in this installment as he proves why he's the best mechanic in the universe. He manages to patch lights, oxygen, and comms back together -- and Control rejoices. But there is still a huge problem. They don't have enough food to get home, and only two working hypothermia couches.
Naturally, being honorable sorts, they argue about who is going to sacrifice themselves and who is going to make it home. They do work out a compromise, although it still won't bring them all home alive.
Hugh then pulls out one of his best miracle solutions ever. I am not convinced that the science completely works, but the boys earned this stroke of good luck with all of the hard work they did.
Hugh also has an unexpected last-minute rescue that seems to come out of nowhere and prevents this book from getting five stars from me.
Sir George retires at the end, which is going to make future installments very different. Past this point, I believe I have only read one more in the series, and that a long time ago, so now I am entering unknown territory with my favorite space polycule.