Costume shop owner Margo Tamblyn faces a deadly conspiracy when a small-town festival turns into big-time trouble. It’s no secret around Proper City, Nevada, that the Sagebrush Festival, the town’s annual family-friendly event, is the place to be. This year’s theme of board games has everything from Conspiracy to Clue. Margo Tamblyn’s costume shop, Disguise DeLimit, has been tasked with providing costumes for the festival headliner, the Domino Divas. But on the night of the performance, one fallen Domino threatens to bring down the whole show when head dancer Ronnie Cass is found in her dressing room, unmasked, unprepared, and very, very dead. As the police investigate, Margo learns that Don Digby, her father's best friend, is the prime suspect, tied to the victim by an unsolved robbery connected to Proper City’s past. As conspiracies abound and theories are debunked, Margo seeks to unmask the real killer before her dad's buddy winds up in a costume made with prison stripes.