London, 1922. Orphan girl Alice dreams of more than toiling long hours in Pink’s jam factory. Inspired by stories about the legendary Queen of Thieves, Mary Carr, who terrorized the streets of Victorian London, Alice decides to set up her own gang: the Forty Thieves. She has an accomplice too: sly seamstress Kate Felix from Whitechapel persuades Alice they’d make the perfect team.

Before long, the pair are making headlines in the glitzy world of 1920s Soho, known for their daring heists and for the row of heavy diamond rings that Alice uses like brass knuckles in her frequent brawls. What Alice soon discovers is that a life of crime makes her powerful enemies, including some who are closer to home than they’d like. Alice must sacrifice more than she ever imagined—but the toughest and most beautiful diamonds are formed under pressure.