The film is a contemporary 1920s picture (though the book was published in 1897) that takes place in
New York City. The story involves a mad scientist who forces a man who is down on his luck to enter into an agreement to become a willing subject of the doctor's weird experiments, knowing full well that the result will be the loss of his humanity. Robert Sandell, despondent over his failure as a writer and his mother's declining health, attempts to rob a theatergoer, Dr. Lamb, a sinister, fanatical physician living in the suburbs of New York. Lamb takes the boy to his home, learns his story, and agrees to perform an operation on Mrs. Sandell on one condition – that Robert shall, at the end of eight days time, deliver himself to the doctor to do with as he will for experimental purposes. Frantic with worry over his dying mother's condition, Robert blindly agrees to the bargain. Mother and son take up their residence in the Lamb home, where Robert is closely watched, not only by the doctor, but also by his wife and a grotesque hunchback, whom Robert learns afterwards is the result of one of the doctor's first experiments. Dr. Lamb, anxious to keep his hold over Robert, not only gives him spending money, but also assists him in having his book published through Wytcherly, the head of a publishing company. Robert meets Wytcherly's daughter Angela and promptly falls in love. In the meantime, the days are slipping by to the time of the experiment. Robert has been warned by Mrs. Lamb and the hunchback that great danger threatens him. At dawn, they show him as a warning a mysterious underground vault which holds a complete operating room and a tunnel of cages in which are confined strange half-human prisoners – the previously failed experiments of Dr. Lamb's. In agony and fear, Robert pleads with the physician and tries to buy his way out of the bargain, for now that his book has been published, he is now a successful writer. Only one day remains before the time limit is up, but the doctor, realizing his victim is considering escaping, seizes him and straps him to the operating table. Robert is rescued by Mrs. Lamb, the hunchback releases one of the cage doors, and the doctor is himself brutally murdered at the hands of an ape-man who was destroyed mentally by the doctor's experiments. Finally freed from the terms of his "blind bargain", Robert returns to his home to learn that his book has met with success and that Angela awaits him at the altar. ) is shocked by what he has read in the notepad that the Ape Man (
Lon Chaney) has given him. == Cast ==