Teddy Crutcher has won Teacher of the Year at the prestigious Belmont Academy. Everyone thinks he's brilliant. Only you know the truth.

They all smile when he tells us his wife couldn't be more proud - though actually, no-one has seen her in a while. They're impressed when he doesn't let anything distract him - even the tragic death of a school parent. Even when the whispers start, saying it was murder.

You're sure Teddy is hiding something. You're sure you can prove it.

It's just that when it comes to catching a killer, there's no place more dangerous than just one step behind . . .