Hal Farrel, a clean-minded young man, is keeping bachelor apartments with Dick Carew, who “loves the ladies.” Farrel is a misogynistic. Carey has a sister, Marietta, a lovable hoyden of a girl who is an unconscious flirt just because she is so full of life. One day Marietta calls at the office of Peabody and Company, where the two young men are employed. Upon being shown to her brother she asks him who the fine young man is in the outer office. Carew tells her that it is his woman-hating pal. Marietta determines to interest him. Since Carew believes his pal is a hardened old cynic he doesn’t hesitate to make a wager with his sister of a fur coat that she will interest him. When Carew with set face appears he answers Farrel’s query of “Who is she?” by saying, “Naughty Mable, the burlesque queen.” That night, when Carew dresses up for another wild night, he asks Farrel to accompany him, so he may see “Naughty Mable.” Farrell replies that no woman can fascinate him. After Carew has gone, Farrel examines some photographs of himself that he has recently had taken, five in all, and then pens a letter. At a secluded corner of a street a cab stands waiting. Suddenly Dick Carew appears and is instantly joined by a woman muffled in sable furs and a black mask. The two, after a hasty conversation and the exchange of something bulky, get into the cab. Farrel meanwhile finishes his letter and departs to the corner mail box to post it. When he returns home, to his surprise he finds a horse and cab tied to his hitching post. He is even more greatly surprised when he sees a light burning in his room above the street. Farrel lets himself into the house and goes up the stairs, only to find his room dark. Farrel enters his room, turns on the lights and finds one of his photographs missing and all the drawers of the dresser standing open. He decides that his pal has returned and is playing some joke, so he starts across the hall to Jack’s bedroom. He listens at the door, then recoils in surprise upon finding a dainty rhinestone barretta upon the floor of the hall. Determined to solve the mystery, Farrel pushes open the door and rushes into the dark room and turns on the lights to find himself looking into the barrel of a revolver in the hands of a woman, attired in a tight-fitting evening gown of black velvet and a sable mask to match, while on one of the chairs hangs an elegant sable fur piece. The midnight visitor speaks not a word but forces him back into his room where she coolly demands the keys to his employer’s office and makes him hand them over. He is struck by her loveliness and begs her to remove her mask, but she refuses. The time quickly passes in jolly repartee. Then she leaves. For just an instant she leans near him and in the madness of the moment he clasps her to him and kisses her lips through the little slit in the black domino. Farrel hurries to the window to see the woman climb into the waiting cab and vanish. Following that midnight visit, Farrel has no peace of mind left and actually begins to look thin and wan, especially when he receives a taunting letter from the masked woman daring him to find her and offering him the right to kiss her without ceremony should he find her. Strange to say, the Peabody Company failed to receive a visit from burglars and Farrel makes the discovery that the girl left the keys she took from him on the staircase. Here Carew decides to play his inning. Meeting his sister at a secluded spot he is forced to listen to her taunts regarding her ability. When he offers to bring Farrel to her, she defuses to listen to such a thing. It is then that Carew has a bold scheme. That night he invites Farrel to accompany him to his home in another city to spend the weekend. Farrel accepts. Farrel and Carew arrive at the latter’s home unknown to Marietta, who has been away all day. That evening, Marietta is reading in the library with her back to the door when Carew slyly leads Farrel before the door and, feigning some excuse, withdraws. Farrel quickly sizes up the library and with it the girl whose back is facing him and recoils in wonder for in the girl’s wonderful hair reposes the rhinestone barretta, easily recognizable because of its oddity. He starts toward her and forces her to turn round. He kisses her, and she resists only for the moment then lies quite willingly in his arms.