Game theory has brought me to this point and I must follow where it leads. Even though this is not a game.

Jamie is a sixteen-year-old maths whiz. Summerlee, his older sister, is in the grip of a wild phase. Tensions at home run high.

When Summerlee wins a 7.5-million-dollar lottery, she cuts all ties with her family. But money can cause trouble - big trouble. And when Jamie's younger sister Phoebe is kidnapped for a ransom, the family faces a crisis almost too painful to bear.

Jamie thinks he can use game theory - the strategy of predicting an opponent's actions - to get Phoebe back. But can he outfox the kidnapper? Or is he putting his own and his sister's life at risk?

A brilliant, page-turning novel from a superb storyteller.