This book chronicles the rise and fall of the Kray twins, notorious figures in London's 1960s underworld. The narrative details their ruthless ascent to power through swindling, extortion, and terror, establishing an unparalleled criminal empire. It also explores their dual life, enjoying celebrity status amidst the swinging sixties scene, until their eventual downfall and life imprisonment.

This account of the Kray twins' criminal careers is widely regarded as a definitive and classic bestseller. Its detailed portrayal of their ruthlessness and the dual nature of their lives, as both feared gangsters and celebrated figures, has cemented its place in true crime literature. The book's enduring popularity is further evidenced by its adaptation into a major film, indicating its significant cultural impact and continued reader interest.