"A gripping and gloriously treacherous thriller without guide ropes or safety nets. Leave all certainties by the door." Frances Hardinge A taut thriller about murder, maths and the mind. Peter Blankman is afraid of everything and must confront unimaginable terror when his mother is attacked.

Seventeen-year-old Peter Blankman is a maths prodigy. He also suffers from severe panic attacks. Afraid of everything, he finds solace in the orderly and logical world of mathematics and in the love of hi...