Ugleeuh is a beautiful raven haired young woman who is the half sister of Queen Minuet of the kingdom of Niarg. She is raised by the good wizard Razzmorten Dewin, and throughout her life is thought to be his daughter by a brief marriage to the evil sorceress Demonica. In Good Sister, Bad Sister, she falls under the influence of her wicked uncle Razzorbauch, who makes her a partner of sorts in his sukere enterprise.
Razzorbauch appropriates the Forest Primeval, a vast virgin oak wilderness and burns off a substantial part of the middle of it to establish a great plantation in order to produce the seriously addicting sweetener, sukere. He allows the un-burnt forest surrounding his plantation to remain standing, but he magically alters all of the oak (Quercus) trees, turning them into deadly choke oaks (Pseudoquercus horridus R.) to discourage visitors.
Ugleeuh becomes hopelessly addicted to sukere, and though she remains an active sukere peddler to promote their enterprise, she tires of Razzorbauch’s overbearing influence and takes to living by herself in a cottage in her own part of the forest. When she tries to poison Queen Minuet and her husband King Hebraun, the crown banishes her to her cottage and has Razzmorten keep her there by putting up magical barriers.
Ugleeuh spends the rest of her life alone, turning into a sallow hag from the ravages of her sukere
addiction. To keep from going mad from loneliness, she begins magically altering her surroundings at once. She turns all of the choke oaks into peppermint trees (Mentha lignumpiperita R.), with ludicrous red and white barber pole striped trunks. And by the time that Rose and Lukus find her in The Collector Witch, she is more dangerous than ever, living with a bloated crow, too obese to fly and a palsied cow with colored teats which give flavored milk, and she has managed to turn most of the remaining animals of the woods into talking enchantments, all addicted to sukere.