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As G-Men Mac Richards, Captain Phillips and others fight off armed gangsters holed up in a tenement building, Mac decides to outsmart the gang by climbing onto the roof and throwing a gas bomb into the room that the gangsters are occupying. His plan succeeds and the gangsters are soon captured. Later, Mac takes his sweetheart, Helen, the daughter of Captain Phillips, to see the world championship boxing match between title holder Moran and his challenger. As the event begins, however, Moran's manager announces that Moran has been kidnapped. After receiving a note from the kidnappers demanding a ransom payment of $200,000, fight promoter Jack Benson calls Mac and then packs the money in a satchel and goes, with Helen, to a railroad station, where he has been instructed to deposit the cash in a locker. Mac posts a number of undercover officers at the railroad station, but when Jack arrives to make the exchange, he is informed by telegram that the kidnappers have discovered the placement of the agents there. Benson is then instructed to have the money sent by one of his ushers in a cab. Mac disguises himself as the cab driver, while Helen, disguised as Benson's usher, is his passenger. A car soon pulls up beside the taxi cab, and when Mac is ordered to stop, the kidnappers take his keys, the money and Helen. While the gangsters divide the ransom money at their hideout, Helen makes an unsuccessful attempt to capture them. The kidnappers then flee with her when they hear police sirens. When Mac and the police arrive at the hideout, the landlady tells them that she overheard the gangsters mention the words "Cherry Blossom" and that they scribbled a telephone number on the wall. The number turns out to be that of the River Yacht Club. The police go there, and after finding the nightwatchman bound and gagged, they learn that Cherry Blossom is the name of a yacht that has just left the dock. Mac goes after the yacht, and when he reaches it, he finds Helen, tied up and alone, and rescues her. Mac then learns that the boat is registered in Benson's name, but when he accuses Benson of being behind the crime, he denies it. Moran himself and Benson's assistant, Joe Carter, are eventually revealed as the men behind the kidnapping hoax when Mac follows Carter to a garage where the gangsters are hiding. The gangsters are soon apprehended, and when the police find Moran in the trunk of an automobile, they save him in time to take him to the boxing ring for the start of the fight. Moran loses to his opponent in a knockout in the first round, but Mac is upset when he misses seeing the winning punch.