Heaven Knows, Mr. Allison

Aroview: Kerr and Mitchum play a nun and Marine sergeant respectively, who are stranded on a desert island during WWII - the island happens to also be a Japanese base.

Possibly even better than dir. Huston's own AFRICAN QUEEN, which it resembles, this effectively portrays its characters' humour, inhibitions and courage under pressure, as they slowly fall in love.