Purebred dead

Pillar of the community, Mary McGill has a finger in every pie, a place on every committee. She is the one the townsfolk can count on when they need help. Everything Mary organizes runs smoothly, apart, that is, from the town's traditional Christmas pageant. For the festivities are rudely interrupted by the discovery of a blood-stained corpse lying in the manger. Cowering beside the body is a small black-and-white puppy. Two local children report seeing a shadowy figure fleeing from the scene but there are no clues as to the murderer's identity. If Mary could only find out what the puppy was…