It all started with a cat and ended in murder. Here’s how it happened: Annabelle Heyer, going looking for her missing beloved pet, discovered the corpse of the house’s owner in the neighboring home. Local police are ready to blame the death of an elderly person on age-related problems. But the meticulous Annabelle finds a strange fact: it turns out that over the past time, as many corpses have been found in people’s own homes as had not been found in several previous years. Is it a tragic coincidence—or the work of a maniac murderer? The police don’t react to her statement at all, and then Annabelle decides to unravel this complicated tangle on her own…