Dick Halstead, a jewelry salesman, is sent to deliver a necklace worth $6,200 to a Mrs. Collingwood, a neighbor of his friends, the Barrys. Tom Barry and his young wife invite Dick to spend a night at their house. As he had to deliver the necklace to his wealthy patron the following day, he accepts. He shows the necklace to Tom and Pearl and they are fascinated by its beauty. They lock it in their safe, the combination of which is known only to Tom and his wife. They retire. Mrs. Barry, addicted to the sleep walking habit, although this was unknown to her husband, gets up in the middle of the night, opens the safe, takes out the jewels, and re-locks the safe. She then wanders around the house and finally goes out into the garden, where she hides the necklace in the hollow trunk of an old tree. She returns to bed. The next morning they come down to breakfast and Dick, being ready to leave, they all go upstairs and Tom opens the safe. To their consternation they find the jewels gone. ...
Moving Picture World synopsis