Wilfred Amory, retired attorney, succeeds in buying his childhood home. It has become a "mystery house" since the owner, a Mrs. Haynes, was murdered there years before. On the evidence of a housemaid, suspicion falls on the mistreated step-daughter and she is convicted and has supposedly died in prison. When young Tom Thurston, Amory's attorney, goes to inspect the house he surprises a "mystery" woman who has been keeping the clocks wound and as the story progresses is found to be a neighbor, Ruth Hope, and author of "The Woman in Grey" a best seller which is all about the murder!