In this melodramatic adventure set after the British evacuated Singapore in 1942, a ship is torpedoed and only four people survive. They are a nun, an RAF officer, a godless bigoted business magnate, and a black purser. The four drift for days before getting themselves washed up on a small desert island. Before they reach the shore, a shark consumes the purser. The other three safely land and struggle to survive. Time passes and the RAF officer falls in love with the nun, who never tells him that she is one. Later they are rescued, and the officer begins looking for her in vain. At one point he passes her dressed in her habit on a London street, but he doesn't recognize her.