When Edith Wight's parents fail to collect her from boarding school for the summer holidays, she's packed off to live with her eccentric Uncle Francis - a vet who runs a practice in a remote part of the New Forest. Francis is the last in a long line of vets who treat mythical creatures: among his patients are pegasi, unicorns, dragons, and much more. And when he receives a summons from the Himalayas - where one of a remote family of yetis is suffering from a mysterious illness - Edith finds herself on the voyage of a lifetime.