On a coveted two-week beach vacation, working mom Kate Baker’s nine-year-old daughter, Olivia, vanishes suddenly among the waves. But in the next moment, Olivia resurfaces, joyously splashing. What would I do if she didn’t come up? Kate doesn’t have to wonder. Because in that “other” world, Olivia doesn’t come back up. Told in parallel timelines, Kate begins to live two lives. In the reality that follows her daughter’s death, she maneuvers through grief, rage, and the ques­tion of purpose in the aftermath of such profound loss. In her alternate timeline, while she explores a tremulous romance with her best friend, Jason, she finds Olivia pulling further away. The line between joy and loss seems to get thinner with each passing day. Woven into a single story, both Kates discover a breathtaking fragility and resilience in their respective journeys.