Against all odds, Aydin Torkal - aka Sleeper 13 - broke free from the terrorist group that took him as a child and raised him into a life of violence and hate.

In the two years since, he's been tracking and killing those responsible. But he's not done yet.

Now living a secret life in London, MI6 needs his help infiltrating a sinister new terrorist cell. In order to halt their deadly ambitions, he must convince the world's most dangerous terrorists that he's one of them.

He must do it before the world suffers another deadly attack.

And he must do it alone.

He is IMPOSTER 13.