Bill and Leola, old sweethearts, meet in the park and talk over old times. That evening in their respective homes they are preoccupied and at last the suspicions of Bill’s wife and Leola’s husband are aroused. They visit Prof. Chiro the next day and the husband is told to beware of a dark young man, while Bill’s wife is warned that a blonde is trying to alienate her husband’s affections. Each determines to pursue the cause of the trouble and an exciting search follows. Finally, wearied of the chase, they call on Prof. Chiro again for advice, and he tells them to see Jingse, the detective, who occupies the next room to his. They do so, but do not recognize the detective, who is the professor in disguise. Each gives him a portrait to be used in tracing the parties. While visiting the two homes in the discharge of his duties the detective recognizes the originals of the pictures and comprehends the situation. He tells Bill and Leola to be in his fortune telling parlors at a certain hour, and also tells the husband and wife, respectively, to be at his detective’s rooms at the same time. He first interviews the husband and wife in his role of detective, collects his money, and then tells them that the professor next door will fix them up. The detective makes a quick change and slides through a door into the house next door, where, as the professor, he again collects. Then bringing the two couples together, an explanation follows.