Black Narcissus - Michael Powell, Emeric Pressburger

Sister Clodah is dispatched with four other nuns to establish a new convent far in the Himalayas. It's a difficult journey and their new house is a ramshackle old building on the edge of a cliff that had been abandoned by a religious Brotherhood many years before. They soon establish a school and an infirmary though the local General's agent, Mr. Dean, warns them against treating the deathly ill as they would no doubt be blamed if the patient doesn't recover. The location, the culture and the mountain air all begin to have a strange effect on the Sisters. Sister Clodagh, who is also on her first assignment as Sister Superior, begins to remember a romance she had as a young woman before entering the sisterhood. Another however, becomes obsessed with Mr. Dean, which leads to tragedy.