Jamie is a 16-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. 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?.