Fireman Bill Carey and police officer Tom Gerrity are rivals for the hand of Nan Clark. Each hopes to marry Nan so that her father, Councilman Clark, the city finance commissioner, will award their respective departments huge appropriations for new equipment. Bill really loves Nan, but she insists that her baby daughter Sandy select the man she marries. Both Fire Chief Galvin and Police Chief O'Hara support the courtships of their employees and collect money to buy a birthday gift for Sandy. Bill takes Sandy to the store to select her gift, but when she wanders away and ends up at the police station, he becomes the object of ridicule. This prompts Junior and Bagshaw, firemen friends of Bill, who have a bet that Bill will win Nan's hand, to persuade Bill to try caveman tactics on Nan. Their advice backfires, however, when Nan becomes infuriated with Bill's behavior and agrees to marry Tom. Undeterred, Bagshaw and Junior plant a firebomb in the church on the day of the wedding, thus succeeding in postponing the ceremony. When the pair are found locked in the church basement, however, Bill is blamed for the mishap and resigns. After they return home from the ceremony, Sandy follows Bill's dog to the fire station. When the police arrive to ransack the station in search of Sandy, Bagshaw and Junior conceal the missing baby. After a fire alarm sends the wagons rolling out of the station, Sandy is spotted blissfully riding on the hook and ladder truck. Everyone gives chase and in the confusion, Sandy wanders onto a high ledge of a burning building. Bill heroically rescues the baby, thus winning Nan's gratitude and hand in marriage as well as reinstatement in the fire department.