When cat detective Gatsby is called out to the Blue Moon horse farm to investigate a possible murder attempt on an ex-racehorse, he finds that the farm is a hotbed of new rivalries and old grudges. With no help from his housebound partner Yoshi, Gatsby finds himself out of his element and in the line of fire. For the first time in Petectives history, Gatsby can't rely on Yoshi to unravel a deadly mystery. Or can he?