Night of the Nyctalope is a collection of 17 stories featuring Leo Saint-Clair, France's premier pulp superhero from the 1920s and 1930s. The title piece is a translation of a rare original tale published in 1944 by the character's creator, Jean de La Hire, in which Leo saves a young woman from the clutches of an evil sorcerer in Occupied Paris.

Sixteen other stories, all written especially for this volume, offer more exciting adventures spanning over a century, from Leo's first exploits against dark mystic powers in 1900 Paris, his adventures as an explorer in darkest Africa before WWI, his secret missions on Earth and on Mars during the Great War, his encounter with Dracula before the Fall of Berlin, to his very recent visit at the Jet Propulsion Laboratory in Pasadena...