Class 7T - 32 children.

All of those innocent, young people with their whole lives ahead of them.

Most of them are blissfully unaware of the horrible fate about to befall them in the near future - and the murders they'll have to witness before their own.

One person knows what's about to happen, and everyone else realises that it's a race against time; a race to find the killer before it's too late, and there's nobody left alive.

Because it's one thing to know you're being hunted down; but another to have the terrible truth haunt you every night before you go to bed - that, by Friday, 7T will be completely gone.