Jack Mattingly is a genius.He has an IQ of 170.He speaks fluent Mandarin and Latin.And he can calculate the square root of 1,673,549 in his head.But when Jack's parents' car is hi-jacked, with him inside it, for once he's as clueless as the rest of us. The car-jacker doesn't know Jack's in the car - yet. But it's only a matter of time before he's discovered. And then, anything could happen. Only one thing's for sure: Jack's in for the thrill-ride of his life . . .A high-octane adventure from the winner of the Blue Peter Book of the Year Award.