Galloping Dick, a clever thief, occupies fashionable bachelor apartments. He is invariably accompanied by William, who acts the part of valet and body-servant while in the apartments, and as an expert, faithful and clever accomplice in the robberies committed by Galloping Dick. One evening William sits in the apartment impatiently waiting for the return of Dick, who arrives finally after a successful robbery and turns over to William some rich jewels which the latter places in a concealed safe built into the wall. In the meantime, the robbery has been discovered and there is great agitation in the mansion where Mrs. Richwell has discovered her loss. Detective Haggerty is notified of the robbery and arrives on the scene. A cursory inquiry at once reveals to him that this is another job by Galloping Dick. Mrs. Hyphen-Bonds, one of the wealthy patrons of art, has finished a last sitting for Miss Hawthorne, the clever and fascinating young miniature painter. She states that she is going to Europe, and therefore will pay for the completed miniature. While so doing, she accidentally drops from her purse an invitation to a masque ball at the Hunt Club. The invitation contains a playing card, the ten of hearts. Dick Comstock, a young automobile salesman, decides at five o’clock that it is time to leave his place of business. His evening is open and he does not know what to do with himself. At the Hunt Club all arrangements are being made for the ball. Detective Haggerty, believing that he is at last upon the trail of Galloping Dick, calls at the apartments which his deductions have designated as a lair of his prey, and obtaining entrance, awaits the return of the thief. Miss Hawthorne and her uncle go to dinner at the Moquin Cafe, and it so happens that Dick Comstock is shown to a seat at the same table. The waiter brings him a newspaper, and he sees the announcement of the masque ball at the Hunt Club. He decides upon a lark, sends the waiter for a pack of cards and after shuffling and cutting draws the ten of hearts. Miss Hawthorne is deeply interested both in the handsome young automobile salesman and in his selection of a card. The three enter into conversation and Miss Hawthorne, after startling her uncle by explaining that she will attend the ball surreptitiously as Mrs. Hyphen-Bonds, goes to a costumer to select something to wear. Within the next half hour, Comstock goes to the same costumer and selects a suitable .disguise to wear at the ball. Galloping Dick enters his apartment and the waiting detective covers the thief and William with his revolver and demands their surrender. They trick him into close quarters, seize and bind him and toss him into the closet. On his person is an invitation to attend the masque ball at the Hunt Club in order to guard the jewels, and enclosed with the letter of explanation and invitation, is a playing card, the ten of hearts. Galloping Dick abstracts this, and decides to seek a new hunting ground at the masque ball that night. William is to accompany him. Galloping Dick goes to the costumer and there meets Dick Comstock. All goes merrily at the ball. Galloping Dick succeeds in cleverly stealing a gorgeous diamond tiara and a rope of exquisite pearls, which he passes to William through the door leading to the cellar. In a few moments there is wild consternation. The women proceed to announce their loss to Teddy Hamilton, the club manager, and he declares to the assembly that there is a thief among them. Bold Galloping Dick has pinned the detective badge of Haggerty to his waist-coat, ascends the platform, throws off his disguise, announces that he is Detective Haggerty and ends by saying that everyone present shall remain until they shall have been identified. Dick Comstock realizes that there will be an extra ten of hearts to be shown and does not desire to be caught. He confesses to the fascinating Miss Hawthorne that he is an impostor; whereupon she confesses that she also is an impostor. Hand in hand they run from room to room in an endeavor to escape from the house. Comstock finds the way to the cellar and they hasten into the subterranean darkness hoping to find an exit leading outside. In the cellar they accidentally encounter William, who draws his revolver and “sticks them up.” William compels Comstock to take a pair of wire cutters and remove a wire screen from the window and then makes his escape with the stolen jewels in his possession. The young couple stumble back up the stairs and flounder into the drawing room where they are immediately pounced upon by the local constabulary, the members of which have been summoned by Hamilton. Detective Haggerty has at last escaped from the closet and makes all speed to the Hunt Club. Galloping Dick is located in the village inn by Haggerty, who has mobilized the village constabulary, and who enter upon the scene just as Galloping Dick is robbing young Comstock and Miss Hamilton, who have been released upon the recognition of Teddy Hamilton, an old friend. Haggerty arrests Galloping Dick and William, after a sharp encounter with revolvers. Galloping Dick, the gay society buccaneer, is marched away with a broken wrist, while Dick Comstock and Miss Hawthorne rapidly cement their friendship which immediately assumes the proportion of a love affair.