Matthew's parents are worried. At eleven, he's much too old to have an imaginary friend, yet they find him talking to and arguing with a presence that even he admits is not physically there. This presence - Chocky - causes Matthew to ask difficult questions and say startling things: he speaks of com...

Matthew's parents are worried. At eleven, he's much too old to have an imaginary friend, yet they find him talking to and arguing with a presence that even he admits is not physically there. This presence - Chocky - causes Matthew to ask difficult questions and say startling things: he speaks of complex mathematics and mocks human progress.