Someone is masquerading as a murderer at Proper City’s annual Sagebrush Festival—and it’s up to costume shop owner Margo Tamblyn to solve the case.

It’s time for the annual Sagebrush Festival in Proper City, Nevada, and this year’s theme is family game night. Margo Tamblyn and her dad, owners of the Disguise DeLimit costume shop, have provided costumes for local dance troupe the Domino Divas, who each wear a different color domino mask. When head dancer Ronnie Cass misses the performance, Margo finds her dressed to kill in her costume—and dead.

As the police investigate, Margo learns that Don Digby, her father’s best friend, is the prime suspect, tied to the victim by a long-ago unsolved robbery. Now Margo must unmask the real killer before her dad’s buddy winds up in prison stripes.