D (a tale of two worlds) : a novel / Michel Faber.

Between England and the wintry land of Liminus, a world enslaved by the monstrous Gamp and populated by fearsome, enchanting creatures, the letter D disappears. First it vanishes from Dhikilo's parents' conversation at breakfast, then from the road signs outside. Soon the local dentist and the neighbor's dalmatian are missing, and even the Donkey Derby has been called off. Dhikilo is summoned to the home of her old history teacher Professor Dodderfield and his faithful Labrador, Nelly Robinson. -- adapted from jacket