Bonny Blankenship’s most treasured memories are of idyllic summers spent in Watersend, South Carolina, with her best friend, Lainey McKay. They swam and wished for happy-ever-afters, then escaped to the local bookshop. Until the night that changed everything, the night that Lainey’s mother disappeared. Now, in her early 50s, Bonny is desperate to clear her head after a tragic mistake threatens her career as an emergency room doctor. With her troubled teenage daughter in tow, she goes back to the beloved river house, where she is soon joined by Lainey and her two young children. They reunite with bookshop owner Mimi, who is tangled with the past and its mysteries. As the three women cling to a fragile peace, buried secrets and long-ago loves return like the tide.