The business of death is never simple. Booked on a cruise ship headed for Hong Kong, Asato Tsuzuki finds himself entangled in yet another one of Dr. Muraki's neferious schemes.

There's a killer on the loose and corpses are piling up at an alarming rate. Tsuzuki immediately suspects his old nemesis is somehow involved. But his theory falls apart when Muraki unexpectedly becomes one of the murderer's victims.