Manabu Yukawa, the physicist known as "Detective Galileo," has traveled to Hari Cove, a once-popular summer resort town that has fallen on hard times. He is there to speak at a conference on a planned underwater mining operation, which has sharply divided the town. One faction is against the proposed operation, concerned about the environmental impact on the area, known for its pristine waters. The other faction, seeing no future in the town as it is, believes its only hope lies in the development project.

The night after the tense panel discussion, one of the resort's guests is...