On Christmas Eve 1950, Wilfred Butler dies in a burning accident outside his mansion in East Willard, Massachusetts. The residence is bequeathed to his grandson, Jeffrey. Twenty years later, lawyer John Carter arrives in East Willard on Christmas Eve with his assistant and mistress Ingrid, having been charged by Jeffrey (now registered as a patient in a mental asylum) to sell the house. The house, the town, even Jeffrey himself — all hold dark secrets that will be brought to light.

Cornelia Van Gorder has various people arrive at her old mansion, including her niece, Dale, a bank employee, and police detective Anderson. When guests start turning up dead, Cornelia begins to suspect that The Bat may be lurking around the estate.

A film projectionist longs to be a detective. He puts his meagre skills to work when he is framed by a rival for stealing his girlfriend’s father’s pocket watch.