Swamp Sister — Robert Edmond Alter

The swamp had no name and no landmarks: just cypress, Spanish moss, and alligators -- and a wrecked plane with eighty thousand dollars inside it. The man who found the Money Plane could have any woman he wanted -- even the deliriously carnal Dorry Mears -- as long as he kept the source of his fortune a secret. But in the swamp no secret was ever safe. And neither was anyone who had Dorry for a mistress.