Edmund Caruthers, London barrister and gentleman, defies his father and his class to represent the poor. With few paying customers, he struggles financially. He's frustrated his betrothed won't set a date to marry him. Dolly Wycliffe dreams of becoming a famous milliner. She loves Edmund, but the life of a society matron isn't for her. Edmund's family and friends remind her that a girl who makes hats can't become the wife of a distinguished barrister. When a woman is found murdered in fashionable Mayfair, their two worlds collide. The victim is a shop girl and Dolly enlists Edmund's help to find the killer. Edmund keeps a friend's involvement a secret and Dolly realizes the toffs have rules they're unwilling to break. Is their love enough to overcome the obstacles ahead? Will marrying be a decision they'll both come to regret?