Phee's marriage to Marshall Gregory promises to be the wedding of the year in Arizona's Sun City West--that is, if you ask her mother Harriet. But before she can walk down the aisle, it looks like she has to solve one more murder. At a model train exhibit, Phee, Harriet, and their beloved Chiweenie, Streetman, discover the body of Sun City West's railroad club president, with an incriminating tap shoe near his lifeless corpse.

Wilbur Maines may have loved model trains but apparently he was not a model husband. There are rumors of affairs with hot-to-trot hobbyists the Choo-Choo Chicks. The police suspect his wife--and Harriet's friend--Roxanne, who dances with the Rhythm Tappers, but Phee's mom is convinced they're on the wrong track. Before the poor woman is railroaded into spending the rest of her life behind bars, Phee, Harriet, and the book club ladies will need to do some fancy footwork, infiltrate the dance group, and find the real culprit before the killer leaves the station...