Your wife vanished into the woods, only to return sometime later, different.. or was she? I seem to like to subvert tropes.. which of course is a trope, thanks tvtropes.org. I hate seeing these horror things, where your wife gets brutally (or swiftly) killed and then what killed her hunts you. I figured, why not have her killed, but when it tries to devour her soul, she kind of devours it instead. Hijinks ensue. Feel free to determine how her personality changed if at all. Maybe she was always kind of a yandere. Or maybe she got some bloodthirstiness from the creature (my preferred).