Shy trans teen Bass reluctantly skips school and goes on a boat trip with his adventurous girlfriend, Rosie. When a sudden storm smashes their boat on the rocky shore of a deserted island, Bass and Rosie struggle to make it to safety. Bruised and battling hypothermia, the pair have to work together to survive. Rosie, an experienced climber, decides to scale a steep cliff to find help, but she falls and injures herself badly. Now Bass has to find the strength and courage to swim for help before it's too late.