When Huckle and the gang hear strange mumbling voices in the Busytown Museum, it begins to look like it?s coming from the new Mummy Exhibit. However, after tracking down the clues and putting them together, the sounds turn out to be the voices of the workmen echoing up through air vents from the basement. The ice cream shop smoke alarm keeps going off but there's no fire to be found. Huckle and his mystery-solving team get the smoke alarm tested by Mr. Fix-it and he determines it's working properly. Huckle discovers the source of the smoke is a barbecue cart parked too close to the window outside.