Kittery Harbor, Maine, may not be a hotbed of criminal activity, but Sunny Coolidge and her feline companion, Shadow, have a knack for nosing out trouble. While Shadow copes with a sore paw and an irritating puppy invading his turf, Sunny gets mixed up in a financial dispute between rival vets and ex-spouses Jane and Martin Rigsdale. Sunny agrees to help Jane confront Martin about his moneygrubbing ways, only to find herself caught at the scene of a crime: Martin has been murdered.

Though Jane is pegged as the lead suspect in the investigation, Martin, with his greedy ways and his catting around, did not have a shortage of enemies. Did a scorned lover or cheated creditor put Martin down for good? It's time for Sunny and Shadow to team up again, sniff out a killer, and clear Jane's name before someone decides to put them to sleep, too.