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At the end of the eighteenth century, the British navy at war with France was undermanned. The British navy forcibly captured a group of young people aboard the warship HMS Halberd. After these young people boarded the ship, a strange case occurred: on a new moon night, a sailor was suddenly hit with a heavy object and died in full public view, but no eyewitness testimony could be found about the murderer; a sailor who was alone in a solitary room was shot in a secret room, with only guns at the scene. Who was the murderer and why did he commit the crime on a ship with nowhere to escape? Murders occurred one after another, and Vernon, a former sailor officer, was ordered to investigate the case. Can he, who is familiar with the nature of sailors, solve the mystery? The author created an impossible crime on a sailboat during a fierce naval battle. This book was the winner of the 33rd Ayukawa Tetsuya Award.