Heaven Knows, Mr. Allison is a 1957 American CinemaScope war film directed by John Huston. It stars Deborah Kerr as an Irish nun and Robert Mitchum as a U.S. Marine, both stranded on a Japanese-occupied island in the Pacific Ocean during World War II.

Plot

In the South Pacific in 1944, U.S. Marine Corporal Allison and his reconnaissance party are disembarking from a U.S. Navy submarine when they are discovered and fired upon by the Imperial Japanese Army (IJA). The submarine's captain is forced to dive and leave the scouting team behind. Allison reaches a rubber raft and, after days adrift, reaches an island. He finds an abandoned settlement and a chapel with one occupant: Sister Angela, a novice Irish nun who has not yet taken her final vows. She has been on the island for only four days, having come with an elderly priest to evacuate another clergyman only to find that the Japanese had arrived first. The frightened natives who had brought them to the island left the pair without warning, and the priest died soon after.