A Japanese ship sailing in the Pacific is stuck in a major storm. During the storm, the captain of the ship is murdered. The master-at-arms questions the 4 suspects: the cook was busy holding the wine barrels in place, the ship's engineer was fixing the signal, the housekeeper was fixing the flag that had turned upside down, and the captain's wife had retreated below deck because the storm made her sea sick. Who was the murderer?
The housekeeper was the killer. The Japanese flag is a red dot in the center of a white background- it can't be turned upside down