A woman and her bridegroom are found murdered in their bed the day after their wedding. It had snowed overnight and the killer left no tracks. It is up to an amateur detective to figure out what happened. Carefully and systematically, he pieces together the clues in this locked room mystery.

While returning from a business trip to Hokkaido, Detective Kamei of the MPD greets a middle-aged traveler in the waiting room of Minami-Wakkanai Station but is ignored by him. On the limited express to Asahikawa, the same man happens to entrust Kamei with a floppy disk before dying. The floppy contains his investigative notes on a murder that happened two years ago...

Hiroshi Hamano, a professor at a medical university, is found dead. Going by the results of the autopsy, it appears he committed suicide by jumping off a roof, but going by eyewitness testimony and physical evidence at the scene, Detective Kamei suspects murder. A ticket for a train trip around Japan is found in the professor's pocket. However, nobody then could have known the shocking truth hidden behind the tour the dead man was supposed to attend...

In 1959, a body of a flight attendant of an international airline is found, strangled. Detective Rokuro Fujisawa takes charge of the investigation with a young detective Ichimura and his investigations lead him to Father Tolbeck as a suspect. But the police are forced to move very discreetly as the time was right after the Second World War, when a sensitive situation that involves Western people and religion is likely to become an international issue. The investigation leads to an unexpected discloser of a shadowy business behind the church that reflects the uncertainty of the time.