"King Balderone, ruler off the Goblins’ world, is miserable because his favourite pet, Riri, has suddenly run away. Three diminutive but clever detectives: Stucco, who can push things; Tchop, who manages the inventory; and Purlius, caster of spells, receive a Royal order from their King. Their mission is to find Riri, and prove to King Balderone that Riri is happier now than when he was living with the King."