A mysterious book unites four teen girls and unlocks the secret that will get each of them through the real-life struggles they face in their lives. Bryn O'Connor is good at keeping secrets. But when a car accident reveals the marks of her boyfriend's physically abusive behavior, the truth is unleashed. And it starts a tidal wave of trouble in Bryn's life: enemies who were once friends, a restraining order violation, and her world unraveled. If that weren't enough, her grandmother Mim arrives, attempting Mexican cuisine and insisting that Bryn try surfing. It's all too much! Even Bryn's habit of daydreaming won't offer an escape this time. But could a mysterious old book she found hold the secret to riding a tsunami like her life?