Jacob Hunt is a teenager: brilliant at maths, wicked sense of humour, extraordinarily organised, hopeless at reading social cues. And Jacob has Asperger's. He is locked in his own world - aware of the world outside, and wanting to make a connection. Jacob tries to be like everyone else, but doesn't know how.

When his tutor is found dead, all the hallmark behaviours of Jacob's syndrome - not looking someone in the eye, odd movements, inappropriate actions - start looking a lot like guilt to the police. And Jacob's mother must ask herself the hardest question in the world: is her child capable of murder?