It's not easy being the new kid at school. It's even harder when people want you dead. Sam's been an outsider ever since he moved to London.

A loner from the North who won't let anyone in. Former head girl and all round school-star Imogen had pretty much given up trying to befriend Sam before that night on Walthamstow high street.

The night he wanted to tell her a secret, and someone tried to murder him. But Sam isn't the only one whose life is in danger.

Although she doesn't know it, Imogen is being watched. And if she doesn't give these people what they want, they'll silence her too.

Permanently.