Christmas is coming, and while Mahoney and the narrator tease each other about being on Santa’s naughty list, Mahoney is tracking down a ring of scammers who really belong on it. They are fleecing the public by taking advantage of the people's good-natured spirit of the season. They also threaten the narrator personally as part of their tactics. Meanwhile a feral cat disrupts the Mahoney household, and the ‘girls’ are helping a new arrival to Cedar Falls who was injured during a traffic accident. They discover that Lynne is running from a dark and dangerous past and needs more help than for an injured foot.