The Cat Who Dropped a Bombshell by Lilian Jackson Braun

While the town of Pickax is swept up in its sesquicentennial celebrations, Koko has developed a strange new hobby: He drops himself from balconies, occasionally landing in the oddest of places. When a young man comes to visit his wealthy relatives, Koko plummets straight onto his head! Meanwhile, a hurricane is brewing, and the visitor's family members soon fall deathly ill. Qwill has his work cut out for him as Pickax-as foreshadowed by Koko-is about to be hit by a bombshell.

The Cat Who Tailed A Thief by Lilian Jackson Braun

When small items disappear throughout the town, the residents are up in arms! Pickax has seldom fallen victim to "big city" crimes, particularly during the holiday season. But after the bridge club's money is stolen, the townspeople decide that there is more to this mystery. The rash of petty thievery started when banker Willard Carmichael and his much younger (and flashier) wife, Danielle, moved to Pickax from Down Below.