Sarah and Elvis can always be found at a charming secondhand shop in the village of North Harbor, Maine. Despite the small-town setting, the daring duo often find themselves wrapped up in murder, but luckily they have help--a quirky group of senior citizens runs an amateur detective agency called Charlotte's Angels out of the store.

The Angels are hired to look into who is sabotaging cat shows in the state, and they decide the best way to do that is to send Elvis the cat undercover as a contestant. But then one of the cat show volunteers is murdered just before the latest competition, and Sarah and the Angels have to catch a killer in two shakes of a cat's tail!