Witness on the Roof

When a poor girl witnesses a murder in Victorian London, the secret threatens her life as a wealthy lady in this classic from the Golden Age of mystery.

Whenever she needed to escape the menace of her scolding stepmother, little Polly Spencer snuck off to her favorite corner among the rooftops of London. But her innocent hiding spot gets her into serious trouble when she spies a crime scene through an open window.
Too afraid to go to the police, Polly is instead sent to live with her well-born mother's family. Many years later, her life has changed considerably. As the wealthy and titled Lady Warchester, she inhabits a world utterly removed from the one she knew as a girl. But when she encounters the pale-faced killer once again, the past and its dangers are suddenly terrifyingly close.