While preparing for her wedding, Yvonne Whelen engages the services of Al Shannon, a private detective, to guard her wedding presents. Her sister, Mrs. Van Austin, thinks it an indirect insult to the guests, but Yvonne is determined to have the protection. After the ceremony, to everyone’s surprise and consternation, an almost priceless necklace disappears. For a while all is confusion, then the guests are searched without result, and everyone is more puzzled than ever. Next day, upon suggestions of Miss Scott, Shannon’s female assistant, an “at home” dinner is planned. A double plot is laid to trap the guilty one. Miss Scott places a valuable scarf pin and a pendant on a dresser in such a way that the thief will leave a clue to his or her identity. She then disguises herself as a maid while Shannon makes up as butler. At dinner, they get a clue which leads to the home of the Van Austins, where, no one being home but the maid, the two detectives steal upstairs and the pin and locket are soon brought to light. Miss Scott quietly tells Yvonne, and she returns with the lady detective to the Van Austin home. Yvonne is bewildered. What does it all mean? She soon finds out when the detectives openly accuse Mrs. Van Austin. To everyone’s amazement, that lady and her husband burst out laughing, and the whole affair is explained. She had just taken the jewels to prove it could be done, notwithstanding the presence of the detectives, who feel pretty cheap to be caught napping. The incident furnishes a sprightly topic of conversation for a long while afterwards.