Welcome to Dressmakers' Alley, a twisted place filled with dark and deadly secrets London's East End 1923. In the heart of Dressmakers' Alley, Madame Pauline's sweatshop is rumoured to be a particularly unpleasant place to work. Filled with seamstresses paid a pittance who turn a blind eye to what darker activities are hidden behind locked doors. Young Winnie Brown is keen to prove her value to the Women Movement and secures a job as a seamstress to investigate the whispers of some unsavoury goings on. Her concerns are soon justified when she hears a desperate cry for help. Meanwhile, happily married, Lady Diane Cooper is the darling of London's high-society. Beautiful and talented, she seemingly has it all. But the strict constraints society assigns her leaves her frustrated, she craves more freedom. With the help of her devoted dresser Susie can she realise her dream? What is the connection between Lady Diane's world and the poor exploited young women of Dressmakers' Alley? Can the two worlds come together for the good of all?