When Eric Gusset hugged goodbye to Gutsy, his one-eared Jack Russell, and trudged off to Tootingsbottom General Hospital to get his ears unclogged, it was probably just as well he'd no idea what was coming next. Because, not only did he come away fixed up with grommets, but with a whole new identity. Turns out he's a witch. Not a wizard or a warlock or even a werewolf but a soppy, cissy, girlified witch! Worse, a numbing 24 hours has seen him landed with Agnes, a swotty twin sister, Hal, a garlic-crunching, vinegar-swilling familiar and another batty auntie to go with the one he's already got! But, shortly after settling in at Druids' Lodge, the newly-acquainted twins are called upon to undertake an undercover underground underhand mission to undermine the Colossogigans who are poised to take over the parallel worlds. With the aid of Dan and Druff, the cat astrologers, Gunkun, the zoomorph in charge of the small slimies at the Invertebrates Breeding Farm, Artus Pledge, Chief Scrutineer of Unnatural Occurrences at the Top Notch Nocturn and the Lads at the Lavvy, Eric and Agnes embark on a risky plan to rescue their universe....