Eden Fox, an artist on the verge of her first big gallery exhibition, returns from a run to the home she and her husband recently moved into — an old house called Spyglass in the town of Hope Falls — and finds her key no longer fits the lock. A woman who looks eerily similar to Eden answers the door, and Eden's own husband insists that this stranger is his wife. The central mystery — one house, one husband, two women, and someone unmistakably lying — unfolds through a structure that jumps back six months to introduce Birdy, a reclusive Londoner who inherits Spyglass after receiving a life-changing diagnosis. Feeney is known as a "Queen of Twists" writer, and this novel continues her pattern of unreliable narration and dual (or multiple) identity threads that force readers to continually revise their understanding of who each character really is and what they want. Reviewers have praised the book's blend of tension and dark humor, describing it as both a tightly wound psychological thriller and, at times, an unexpectedly funny and even romantic read — a hybrid tone that has become something of a Feeney signature. The novel became an instant New York Times bestseller upon release.