A woman essentially gets recruited to marry a rich military man because he thinks they will get along. They wind up falling in love, he teaches her to swim while they are together, but then he had to leave. They write each other. The man's estranged brother comes to "visit" with his wife, whom he married in India, and they just never leave. She discovers she is pregnant. The brother has fits and his wife takes care of them and the main woman realizes he is kind of crazy. They brother and wife plot to poison her and take the husband's money. Along the way the woman's friend/maid is coerced into going along with the mistreatment of the woman, but tries to get away with a message when she finds that the mailman who was supposed to be carrying a letter to the husband is dead. She winds up killing the brother when he comes after her. Husband comes home just in time to save the life of his wife.