My Husband's Wife - Alice Feeney

Eden Fox, a rising artist preparing for her first big exhibition, goes for a run near her home, Spyglass, in the seaside village of Hope Falls. When she returns, her key doesn’t fit, and a woman who looks almost exactly like her answers the door. Even more shocking, Eden’s husband insists that this stranger is his wife — not her. Suddenly Eden’s life, identity, and marriage fall into bewildering doubt.