Lilly's best pal Scarlett “Dixie” Jefferson has done it again! She’s convinced eccentric poodle-loving billionaire Archibald Lowry to sponsor a grand fundraiser for the Eastern Tennessee Poodle Rescue. Tragically, it’s too late to rescue Lowry, who is murdered at the event. His pet poodle is now orphaned, so Dixie begs Lilly to foster the adorable pup. Of course, she already has a poodle—her beloved Aggie, named after Agatha Christie. Fortunately, Aggie seems to like the new addition to the family, whom Lilly renames Rex, after her second favorite mystery author, Rex Stout.
But she’s barely welcomed Rex into her home when there’s an attempted poodle-nabbing, foiled with Aggie’s help. As desperate characters try to get their hands on the canine cutie, Lilly turns to Dixie’s dog training class to help her sort through a litter of suspects. Ultimately, she may have to unleash Rex as bait to collar the killer . . .