While She Sleeps (1940) is a gripping psychological thriller by Ethel Lina White, a renowned author of suspense fiction during the Golden Age of British crime writing. Known for her skill in creating atmospheric tension and exploring the fears lurking beneath ordinary life, White delivers another compelling tale where safety proves to be an illusion. The story follows Marian Tansey, a successful but lonely woman who decides to take a bold step and change her life. Leaving behind her familiar routine, she embarks on a spontaneous European journey in hopes of finding adventure and perhaps a deeper sense of meaning. However, what begins as a holiday quickly turns into a nightmare. Unbeknownst to Marian, a shadowy presence is following her — someone with sinister intent who has carefully studied her habits and movements. As Marian travels through scenic European locales, the reader is gripped by an increasing sense of danger, suspense, and the terrifying knowledge that a killer may strike at any moment... while she sleeps. White masterfully builds the narrative through alternating perspectives, combining psychological insight with a creeping atmosphere of dread. While She Sleeps is not just a murder mystery — it's a chilling meditation on vulnerability, trust, and the thin line between freedom and danger. This novel showcases Ethel Lina White's trademark style: elegant prose, subtle tension, and a keen understanding of the psychology of fear. A forgotten gem of crime fiction, it remains an absorbing and unsettling read to this day.