The Terror of Marks Priory on DVD Marks Priory is a place of fear for Isla Crane, Lady Lebanon's niece. Two strange butlers and the mysterious family doctor, Dr. Amersham, unsettle her, while she finds herself drawn to the architect, Richard Ferraby. Lady Lebanon wants her son, William, to marry Isla, but he refuses. The situation worsens when Isla and Richard discover the chauffeur, Studd, dead...