"Mark's Priory". the family seat of the Lebanons, is a house of terror to Ilsa Crane, secretary and niece of Lady Lebanon. The strange behavior of two sinister butlers, Gilder and Brooks, adds greatly to her fear and her sole consolation lies in the sympathy extended her by young Lord William "Willie" Lebanon. A young architect, Richard Ferraby, arrives from London to inspect the ancient home in regards to renovations, and he and Isla are immediately attracted to each other. Lady Lebanon tells her son that he must marry Isla to carry on the family name but Lord Willie tells her he has no intentions of marrying. Later, the family physician, Dr. Amersham, arrives and it is evident he has some unrevealed hold over Lady Lebanon. The chauffeur, Studd, hints that he knew Aversham in India and that Aversham was discharged from the Indian Army under unsavory circumstances. Isla and Richard find the chauffeur murdered and the suspicion falls on the gamekeeper, Tilling, whose wife had been more...