A horror story with a full background of the werewolf form of madness, and with a plausible explanation disclosed by a private detective. The discovery of an old prophecy turns the new Sir William into a superstition ridden man, with the fear of being a werewolf. The care and kindness of those who love him banish the terror and unmask those who plotted his ruin through a detailed accumulation of calamities. Not hair raising, but a thoroughgoing job of its kind.