Cat Who Moved a Mountain (The Cat Who... Mysteries, Book 13) (Lilian Jackson Braun, 1992)

After five years of legal formalities in gossip-ridden Pickax, Jim Qwilleran has officially inherited the Klingenschoen fortune. In search of a summer's peace, Qwill and his two Siamese cats head for the Potato Mountains. But Qwill finds controversy - one side of the valley is a haven for the descendants of Prohibition Moonshiners, the other home to developers eager to turn the Potatoes into a giant tourist trap. One of the Taters, as the locals are nicknamed, has been imprisoned for the murder of a millionaire developer, but Qwill is convinced the wrong man is in jail. Koko, Yum Yum and Qwill sniff out treachery amidst the pines...