Under the Wall

This version of the book is out-of-print, and is not the new, 2015 release with a different cover and entirely different content.

From Troy Blackford:

Under the Wall is a psychological horror-thriller from Troy Blackford. The family housecat, Leviticus, has been unintentionally hiding a secret. The town's madman, John the Faithful, has been purposely hiding a darker one. Find out which one lets the cat out of the bag first.