If there is a way into madness, logic says there is a way out. Logic says. Tallis, a philosopher's servant, is sent to a Greek academy in Palestine only to discover that it has silently, ominously, disappeared. No one will tell him what happened, but he learns what has become of four of its scholars. One was murdered. One committed suicide. One worships in the temple of Dionysus. And one—one is a madman. From the author of The Brother's Keeper comes a tale of mystery, horror, and hope in the midst of unimaginable darkness, the story behind the Geresene demoniac of the gospels of Mark and Luke.