The Undying Monster, also known as The Hammond Mystery, is a 1942 American mystery horror film directed by John Brahm and written by Lillie Hayward and Michel Jacoby, based on Jessie Douglas Kerruish's 1922 novel of the same name. The film stars James Ellison, Heather Angel and John Howard, and focuses on a series of mysterious deaths within the wealthy Hammond family.

Plot

In the coastal chalk hills of southeast England, the Hammond family home has been cursed since the Crusades, with family members dying or committing suicide under mysterious circumstances. Now, at the turn of the century, twenty years after the last Hammond casualty, two people, including Oliver Hammond, are attacked by an unknown creature. A Scotland Yard scientist, Robert Curtis, and his sidekick Christy are dispatched to investigate. Although the local townspeople are convinced that the attacks are the result of the curse of Hammond Hall - "When stars are bright on a frosty night, Beware thy bane in the rocky lane" - Curtis seeks a more scientific explanation.