Joe R. Lansdale & Kasey Lansdale 
Case of the Bleeding Wall [PDF ebook] 

The new dynamic duo of supernatural-er supernormal sleuthing-Dana Roberts and Jana Davis find themselves face-to-face with the bleeding wall. Carlo shares what happened between him and his fiance , Cincia, and how it led to the "terrible event." Using books of occult knowledge, demonology, and magic the duo investigates further, undeterred by the looming dread seeping from the walls.