The Double Door — Theodora Keogh

Candy de Tudelos, the lovely young daughter of a degenerate, self-styled Spanish aristocrat was cloistered from the realities of the world by her lonely existence in an imposing New York mansion. One day she ventured into the sinister house next door, which her father had peopled with a corrupt and decadent group of associates. There she met an earthy young laborer, and in a brief and bitter love affair learned the meaning of the ugly secrets which had poisoned her life.