From internationally bestselling author Louise Candlish, a witty psychological thriller where an older woman's suspicions about her charming new neighbor ignite a deadly spiral in their luxury apartment building.

In Columbia Mansions, secrets don’t stay behind closed doors for long.

It's rare for a room to open up in London’s storied Columbia Mansions, and lonely Gwen is thrilled when her neighbor’s new subletter, Pixie, brings a friendly breath of fresh air to its stuffy halls. Their unexpected bond soon becomes the bright spot in Gwen’s quiet life. But Gwen can’t help noticing cracks beneath Pixie's cheerful surface—especially when it comes to her questionable financial arrangement with her live-in landlord, Alec.

As suspicions mount, Gwen’s protective instincts go into overdrive, triggering a dangerous chain of events no one is prepared for. The last thing Columbia Mansions wants is a scandal on its hands ... Let alone a murder.