The comic was adapted by Antony Johnston with artwork by Jacen Burrows from a 1994 prose story by Alan Moore (credited as "consulting editor").

His investigation leads him to a nightclub in Red Hook, Brooklyn, where he hears of a psychoactive drug called Aklo, peddled by a mysterious veiled man named Johnny Carcosa.

The comic book adaptation was planned to appear in Alan Moore's Yuggoth Cultures and Other Growths, but it was published as a limited series by Avatar in January and February 2003.

The series was collected in a trade paperback in 2003, a second version (the Companion) was released in 2004, which contained annotations by H. P. Lovecraft scholar N. G. Christakos and reprinted Moore's original short story.

Alan Moore has written a 4-part sequel to The Courtyard called Neonomicon, the final issue of which was released by Avatar on 23 March 2011.