Showing The Cat Who Went Underground by Lilian Jackson Braun

Jim Qwilleran packs up his old kit bag and his two Siamese cats, Koko and Yum Yum, for a sun-and-fun summer at his log cabin in Moose County. Their vacation starts off ominously with the disappearance of a handyman hired to patch up Qwilleran's cabin. But the felines really start throwing catfits when they come across a dead body or two... A serial killer may be right under Koko's nose, and now this ingenious Siamese must dig deeper to clear poor Qwilleran of suspicion - and dig up the buried motive for a catastrophic crime.