Jayce is a homeless man with a beast inside of him, quite literally. A monster he calls wolf, who keeps him solitary from other people and barely making it day to day. Elsewhere, in a nursing home, a man named Max is looking for Jayce. Or for a way out of his prison, which he thinks he will manage if the son he has never met finds him something he wants.

Brian Cave’s Old School Evil takes a while to get going, but after it gets there it is a wildly fun ride. It exists ...