A maritime mystery in which a captain is murdered aboard a coast guard patrol ship, and the closed sea-bound setting narrows the suspects to the crew.

A locked-room crime at sea quietly deepens into tragedy.

A courtroom mystery in which attorney Asahi Gakunosuke challenges a false confession in a robbery-murder case in Osaka.

A lawyer sees the possibility of a false conviction in a robbery-murder confession.

This work was confirmed as a prize entry, but no standalone book edition could be verified.

No book edition could be confirmed via Amazon JP, NDL, or the publisher official site.