Y/N Wayne, the youngest member of the Batfamily, has been trained to survive nearly every situation imaginable—but one crucial skill was overlooked: she never learned how to swim. During a routine patrol that erupts into a brutal fight along Gotham's docks, she's knocked through a rusted railing and sent plunging into the freezing harbor below, leaving the rest of the Batfamily to realize the terrifying mistake far too late.