When Mustang Ridges finds her son's school bus driver, Imogene Puzzle, dead, Mustang knows she must find the killer. She and her best friends Haley and Monica are on the hunt for anyone who might want Ms. P. dead. According to the people they interview, Ms. P. was beloved by everyone. They can't find one single person who has anything bad to say about her. In a small town, that's impossible. But clearly someone hated her enough to cut her throat...