A trio of apparent suicides of racing people in the beautiful Lambourn valley in south west England baffles Eddie Malloy. Eddie refuses to accept the police assumption that each death, accompanied by a suicide note, suggests no crime has been committed. One of the dead saved Eddie's life when Eddie was just 19. Fourteen years' later, Eddie knows he cannot rest until he discovers the truth behind the death of his friend. Eddie enlists the help of a woman "with a brain the size of the moon", Maven Judge, a solitary maverick living on a remote Welsh clifftop above Hell's Mouth bay. Eddie believes he is up against a criminal genius. But he is betting that his determination, and the intellect of Maven Judge, can unravel the strangest mystery he has faced.