When the mysterious Mr. Sallow and his companion Crowfoot the Ape arrive at the neglected Dropwort Hall, they soon cure the old place of its ills, from smoky chimneys to the moping sickness in the sheep flock. Everything is running like clockwork until a series of unexplained deaths strikes the household. Is the ancient Curse of Dropwort Hall responsible, or is it murder? The ever-efficient Mr Sallow sets out to discover the truth. But is he being too clever for his own good? The answers can all be found in this delightful, plant-inspired magical murder mystery.