The Devil's Cat — William W. Johnstone

The Devil's Disguise
 
Cats. The town was alive with them. All kinds. Black, white, fat, scrawny . . . They lived in the streets, in the back yards, in the swamps of Becancour. Sam, Nydia, and Little Sam had never seen so many cats. The cats' eyes were glowing slits as they watched the new-comers. And their furry tails were slowly switching back and forth . . .
 
Evil. The town was ripe with it. It seemed to waft in from the swamps with the hot, fetid breeze and breed in the minds of Becancour's citizens. Soon Sam, Nydia and Little Sam would battle the forces of darkness. Standing alone against the ultimate predator --
 
The Devil's Cat