Jim Moriarty is fifteen, suffering from psychopathic behaviour since he was six-years-old. After a failed suicide attempt at his care-home in London, Jim is referred to group counselling sessions for teenagers. And that's where he meets Sebastian Moran, a seventeen-year-old with anger issues.

Murder, chaos and destruction have always been things that Sebastian Moran loves. So when he is employed by Jim Moriarty, who also loves those things, it's almost like the end of the world for everyone they've ever known.