Jim Qwilleran and his cats, Koko and Yum Yum, have a close encounter with a killer in this mystery in the bestselling Cat Who series. UFOs in Mooseville? Rumors abound that a missing backpacker has been abducted, and it looks like Jim Qwilleran's sedate summer may be interrupted by an investigation--with the help of his own little aliens, Koko and Yum Yum. And when the backpacker's body turns up--and transplanted Floridian Owen Bowen is found dead soon afterward--the search for intelligent life turns into a hunt for a murderer...