Unity Historical Society head and antique household items-stuff!-expert Christian Shaw is on set when actor Brett Studebaker falls from the pulpit during a streaming service shoot in an old church. She, the "dads she should have had," Garrett and Ed, her son Henry, who has a photographic memory and Type-1 Diabetes, and her colorful friends end up helping Assistant State's Attorney Joe Poli track the killer. Along for the ride: her giant tuxedo cat, Cookie, Ed and Garrett's big red mutt, Norm, and Joe's tiny dog, Cannoli. Woodworking, embroidery, old poisons, and vintage weapons all figure in the case, which comes together in a wild scene at the Historical Society on Fourth-Grade Field Trip Day.