New England, 2022. Three years ago, single mother Mallory Dunne received the telephone call every parent dreads—her ten-year-old son, Sam, had been airlifted from summer camp with acute poisoning from a toxic death cap mushroom, leaving him fighting for his life. Now, searching for the donor kidney that will give her son a chance for a normal life, Mallory’s forced to confront two harrowing secrets from her past: her mother’s adoption from an infamous Irish orphanage in 1952, and her own all-consuming summer romance fourteen years earlier with her childhood best friend, Monk Adams— one of the world’s most beloved singer-songwriters—a fairy tale cut short by a devastating betrayal.