Presenting an insight into the motivations of those who kill for love, this book provides accounts of 18 murder cases in Britain in the 19th and 20th centuries. From the stories of Ruth Ellis and Alma Rattenbury to those of Constance Kent (who slit the throat of her young brother in 1860) and the Lyons Corner House murders, the author reveals the forensic evidence that convicted the murderers, as well as the pathological findings, and sets out to show that simmering under the fragile surface of human morality can lurk the terrifying impulse to destroy.