by Lilian Jackson Braun
Braun's cat mysteries aren't very intensive, but they are fun and perfect for listening to while running errands around town. I really like the main character, Jim Qwilleran. Qwilleran owns 2 Siamese cats that help him solve mysteries. The title for this book in the series comes from the fact that a murder takes place in Scotland, where Qwilleran was on a sight-seeing trip, and still Koko was able to 'hint' to Qwilleran who the murderer was.
This book actually has several mysteries intertwined and is a bit more complex than the 2 or 3 others I've read. Even at that it took several tapes before the story really got rolling.