In search of inspiration for a veterinary magazine article she's been asked to write, Dr. Harriet Bailey comes across an interesting tale of a 1940s snowstorm, a flock of sheep, and a Yorkshire shepherd who never came home. As Harriet delves into the historical records to separate fact from fiction, she brings to light some long-buried secrets and begins to develop theories about what happened so long ago.

But when a more urgent need arises, her search for the truth of the past is stalled. All over the Yorkshire countryside, flocks of sheep are dwindling, and it's happening too often to be blamed on broken fences or carelessness of the owners. When she learns that Doreen Danby's prize-winning ram, Prince Charming, is among the missing, Harriet realizes that the sheep are not simply wandering away. Someone is taking them, and she believes it is for a specific reason. Harriet will need all her skills to find the sheep rustler and recover the animals before more harm is done.