Seikei, the adopted son of Japan's greatest crime-solver, returns to his home town for a visit to his birth family. He finds that his younger brother is now running the family tea business, but that mysterious midnight deliveries make Seikei suspicious. Most disturbing is the city's famous puppet theater, where not one, but two, murders take place while Seikei is on the scene. As he investigates, Seikei discovers that the real-life models for some of the puppets are friends of his sister's—and all of them are criminals. It will take all of Seikei's crime-solving skills to get to the bottom of the mystery and discover the master puppeteer who is pulling everyone's strings.