Trying to figure out what a strange piece of metal with a number 10 on it is, Huckle and his pals take it to Blacksmith Bear who helps them discover strange writing on it. Figuring it must be a foreign language, they take it to Ms Honey and, with her help, determine the piece of metal is a lost tap from Hilda's French tap dance shoes. Sergeant Murphy directs traffic with the aid of his whistle, but drivers suddenly get confused when someone else blows a whistle too. After the ensuing traffic jam, Huckle and his pals try to find out who the mystery whistle blower is. Following a number of clues leads them to Mr. Fix-it's steam-power car that whistles like a boiling tea kettle.