The boy and his sweetheart are madly in love. Her father tries in every way to break off the match. At last he hires a detective to watch him and prevent the matter from going any further. The girl overhears her father’s conversation over the telephone, however, and she and her lover outwit the old man and his detective and get married. Two famous crooks, a man and a woman, rob a large jewelry store downtown and are getting off with the plunder when they are discovered and chased by the detective. The newlyweds go into a hotel which is the same one that the crooks have slipped into to elude their pursuers. The newlyweds see the detective and thinking he is the one hired by their fathers, rush on the roof, to escape him. He mistakes them for the crooks and chases them over the roof, when finally he comes upon the two real crooks who have taken to the roof, too. A merry chase again ensues, the detective chasing first one couple and then the other. Finally both couples elude him and make off, each bent on reaching a steamer which is about to sail. The two crooks arrive first, and going to a stateroom, the woman hides the diamonds in her shoe. The newlyweds arrive soon after and seek passage. Everything is fixed up when again they see the detective. The chase starts again, this time over the boat. The detective almost nabs them, when the crooks come up on deck and he switches his chase over to them. At last he captures the crooks and searches them, but can find nothing. Thinking he has got the wrong couple, he captures the newlyweds and searches them. All in vain. He is about to give up in despair when his wonderful sense of smell comes to his assistance. He finds the envelope the diamonds were in and immediately recognizes the smell of diamonds. He is hot on the smell which leads him to the woman crook. He again searches her, this time by the sense of smell. The clue leads to her shoe, where he finally locates the stolen jewelry. The girl’s father appears at this instant and after explanations he forgives the loving couple, and thankful that the right crooks have been caught, takes them to his heart.