In the bustling London of the 1910s, a young woman named Mickey, a charming working-class girl, finds herself caught between her dreams of a better life and the harsh realities of her surroundings. After a chance encounter with a handsome young man from the upper class, she becomes embroiled in a series of romantic and comedic entanglements that lead her on an unexpected adventure. Mickey's life takes an unforeseen turn when she masquerades as a boy to survive in a society that rejects her for her social status.