The Demarest Inheritance — Marjorie Carleton

Young Woman in Black
met surprise and suspicion when she came to the forbidding Demarest mansion. “I'm Sandra Demarest,” she said -- “Jim's widow.” Yet none of the family knew that Jim had ever married!

Sandra explained to Mark Caldwell, Jim's darkly handsome uncle, the bizarre pact that had led to the secret marriage -- but she did not reveal Jim's suspicions of Mark, or her fear that he was involved in Jim's sudden death.

Yet Mark Caldwell, magnetic and brooding, attracted her against her will, even as she searched for the perilous truth that lay hidden in the gloomy old house -- a search that was to be filled with terror and danger and to lead to a shattering discovery.

Original Title: Vanished