Grandfather Lir's brooch has broken and Garth and Bev offer to help mend it. But while Skelly the Blacksmith fixes it, Garth and Bev realize they have lost one of the precious stones. When they figure out that it must have got sucked into Skelly's bellows, Lir rewards them with a trip to see Hubert Cecil Booth, who used suction to solve the problem of household dirt with his vacuum cleaner.