Now that she's in her fifties, Penelope Standing has life pretty well figured out. Her pet sitting business keeps her busy, her neighbors are conspiring to get her boyfriend, Jake, to propose, and she has just enough free time to make the corrupt mayor's life miserable.

Then she arrives to walk Brutus, the lovable but ill-behaved mastiff — and finds his owner, Jezza, dead. 

While the police work to uncover Jezza's past, Penelope launches an investigation of her own, talking to her clients as she takes care of their pets. Even Brutus, "temporarily" staying with Penelope and Jake, provides clues.

More than one person had a motive for murder. But only one of them is coming after Penelope…