Private investigator Molly Murphy goes undercover within the household of a senator and his wife, the latter of whom frequently solicits the infamous Sorensen sister spiritualists for information about her presumed-dead son.

"Semi-retired private detective Molly Murphy Sullivan is suffering from depression after a miscarriage following her adventure in San Francisco during the earthquake of 1906. She and her husband, Daniel, are invited for Christmas at a mansion on the Hudson, and they gratefully accept, expecting a peaceful and relaxing holiday season. Not long after they arrive, however, they start to feel the tension in the house's atmosphere. Then they learn that...