"The Vengeful Ghost of the Puppet Theater" is a mystery novel starring Ryosuke Takagi, a folklorist. He becomes interested in a mysterious incident that occurs at an old local puppet theater and begins a deep investigation. Waiting for him at the theater is an old doll that has turned into a vengeful ghost due to a past tragedy. Ryosuke pursues the truth of this incident and tries to solve the mystery with local detective Naoya Miyamoto, but in the end he is swallowed up by the fear of the vengeful spirit. This story skillfully depicts human psychology and supernatural phenomena as past tragedies intertwine with modern horrors.