A Canadian Mountie and his family take a trip to Wales where ancient rituals prove deadly—from an author "in the top rank of modern mystery fiction" (Elizabeth Peters). For mounted policeman Madoc Rhys and his wife, Janet, the pains of traveling with an infant are worth taking young Dorothy to Wales for Great-Uncle Sir Caradoc's ninetieth birthday. Along with every other member of the Rhys clan, they make the pilgrimage to the ancestral pile, to enjoy a few days of drinks, dinner, and—as it turns out—demonic sacrifices. On their first morning at the family manor, Madoc stumbles upon a concussed shepherd and a dismembered ram. It appears to be a botched attempt at an ancient rite, executed by one of those Welshmen who still carry a torch for the religion of the druids. For a spot of fun, the Rhys family decides to stage its own ritual—recreating the fertility ceremony of the Beltane bonfires. But when the flames turn a member of his family into a fireball, Madoc springs to action. Even five thousand miles from Canada, a Mountie always gets his man.