*Flashlight* is a 2025 novel by National Book Award winner Susan Choi. The story begins on a summer night when ten-year-old Louisa and her father, Serk, take a walk on a breakwater. Her father, who cannot swim, disappears, leaving Louisa alone on the beach. The narrative follows the aftermath of this disappearance, tracing the lives of Louisa and her mother, Anne, as they navigate grief and the secrets of their family's past. The novel spans decades and continents, moving from the American Midwest to Japan and North Korea, exploring themes of dislocation, memory, and the invisible currents of history.