The Colour of Murder by Julian Symons
John Wilkins meets a beautiful, irresistible girl, and his world is turned upside down. Looking at his wife, and thinking of the girl, everything turns red before his eyes - the colour of murder. Telling the story of a murder, a trial, and the subsequent psychiatric evaluation, this award-winning crime novel from 1957 is a gripping examination of the psychology of murder and the nature of justice.