When Derek Dumpling joins the Chisleton Constabulary, Supergran must thwart the Scunner Campbell's most daring exploit yet, before Derek has to hand in his truncheon....

Katherine 'Cat' Burglar is, as the Scunner Campbell discovers, a snooker ace. He manages her to stardom... and sets up the Frame of the Century!

Does the aristochractic blood of the Great Sporran of the Isles flow through the veins of the Scunner Campbell? Supergran must find out with a trip to the haunted Castle Haggis...