Katie Solomons has spent her life deliberately staying out of her brother Alfie’s criminal empire. She’s fiercely loyal to him, capable of handling herself, but wants a life separate from violence and business. Then she meets Tommy Shelby. Tommy is intrigued by Alfie’s fiercely independent younger sister almost immediately. Katie isn’t intimidated by him, doesn’t romanticise his reputation, and refuses to let either her brother or Tommy dictate her choices. Their relationship becomes a dangerous collision of two families, two criminal empires, and two stubbornly independent people. Katie sees the violent, emotionally volatile man behind Tommy’s polished exterior; Tommy discovers that beneath Katie’s normally gentle nature is someone very dangerous when her family is threatened. Alfie is absolutely fucking furious about them dating. Katie couldn’t care less.