Aru Ketto is a short mystery story by Jun Mizutani, first published in 1951. It centers on a duel over a woman, arranged so that any death can be made to look like suicide, and follows both the men's scheme and the unsettling psychology of the woman at its center. The story won the fifth Detective Writers Club Award and was later collected in Short Stories 1 in the Mystery Writers of Japan Award Winners series.

A duel over a woman begins as a trap meant to make murder look like suicide.

Genei Jo is a collection of mystery criticism by Edogawa Ranpo. It discusses the definition of detective fiction, genre classification, inverted mysteries, trends in British and American crime writing, Edgar Allan Poe, the relationship between mystery fiction and the literary establishment, and ghost stories. Written by Ranpo as both creator and critic, it became a landmark work of postwar Japanese mystery criticism and won the fifth Detective Writers Club Award.

Ranpo builds a critical map of detective fiction through its history, forms, and attractions.