Shortly after his arrival at the Grand Hotel, Highcliff misses his wife's diamond rings. Having appeared in numerous detective roles upon the stage, the actor, confident of his sleuthing ability, accuses Jenkins, a bellboy, of having stolen the gems. Knowing Jenkins to be honest, Francis declines to believe him guilty. Instead, her suspicions are fastened upon Dorkins, the actor's valet. Circumstances confirm the house detective's suspicions and she follows Dorkins when he leaves the hotel that evening. Later, Francis sees the man presenting a ring to his sweetheart. Sure of his guilt, the girl compels Dorkins to return to the hotel. She is dismayed, however, to discover that the ring really belongs to the valet. Sawdust scattered in a waste basket in the Highcliff suite, arouses Francis' curiosity and she learns that Mrs. Highcliff's gems disappeared immediately after they had been cleaned by Dorkins. At the house detective's request, the man places before her the basket containing the sawdust used to clean the gems. Groping about, Francis brings the missing jewels to light. At this moment, Highcliff, battered and bruised as the result of his sleuthing efforts in the servants' quarters, enters the room. Filled with mortification, the actor-detective loses no time in departing from the Grand Hotel.
—Moving Picture World synopsis