The Thirteenth Treasure — Charlotte Hunt

For centuries evil had permeated the walls of the crumbling Carne Manor House on the lonely moors of Cornwall, and the wickedly diabolical Dr. Manfred Blackton spun his web of terror and duplicity -- this time among the decadent Carne heirs. If he succeeded in his plans he would gain the secret of the Thirteenth Treasure, a legacy given to the doomed family centuries earlier.

Unknown to Blackton, his old adversary, Dr. Paul Holton, discovered the plot through the one person untouched by the Carne curse -- young Frances Carne. With time running out, Dr. Holton, along with the man who loved Frances, tried to save the innocent girl from the evil fate that Dr. Blackton planned for her.