Dr Salt is leaving the dismal and depressing town of Birkden, and his departure can't come soon enough. Recently widowed and newly retired from the practice of medicine, Salt looks forward to starting a new life in a sunnier clime. But before he can go, he must solve the mystery of the disappearance of one of his patients, Noreen Wilks, a young woman in urgent need of a life-saving drug. Believ...