The Black Lizard (Kurotokage) first appeared as a magazine serial, published in twelve monthly installments between January and December, 1934. It features Rampo's main detective character, Akechi Kogorō: a figure who combines elements of Poe’s Auguste Dupin with the gentleman adventurers of British golden age detective literature. The Black Lizard herself is a master criminal and femme fatale, whose charged relationship with detective Akechi and unconcealed sadism have inspired shuddering admiration in generations of readers. The story has been adapted for film and television several times, most notably in a 1968 feature film that included a cameo by Mishima Yukio, and a title song with lyrics by the celebrated novelist. Mishima was also involved in the stage adaptation the same year conceived and directed by Miwa Akihiro, in which Miwa himself played the part of the Black Lizard. It is largely thanks to this classic of 1960s Japanese theatre that the story remains associated with sexual transgression and blurred boundaries between male and female, hunter and hunted, detective and criminal.

Themes of deviance and sado-masochism are central to Beast in the Shadows (Inju),a tale from the height of Rampo’s grotesque period, which appeared in serial form between August and October, 1928. This tale of secret identities, violent sexuality, and dark crimes stands in stark contrast to the genteel detective stories then popular in English literature. It bears comparison with the American pulp fiction serial, the genre that led to the classic modern American crime novel, and with the more extravagant moments of film noir. Beast in the Shadows, however, recalls classic themes in Japanese popular fiction, with origins in the illustrated novels and mass market shockers of the Edo period (1600-1868). Rampo’s special contribution was to combine this strain in Japanese literature with styles and atmospheres imported from Europe: from Oscar Wilde and Maurice Maeterlinck, to Rampo’s own contemporaries in the American pulps and English novels.