Hodgson wrote in a number of related genres, including science fiction, fantasy, and horror, as well as straight nautical adventure.
The novels The House on the Borderland and The Night Land are among his best known works, although they are not considered easy reading as they were deliberately written in an archaic style.
Perhaps currently the most popular of Hodgson’s works are the stories of Carnacki the Ghost-Finder. These are slightly different than the typical occult detective story in that not all the of cases Carnacki investigates turn out to be due to supernatural causes. Sometimes the solutions are more mundane. To my mind, this makes them more interesting.
Carnacki is popular enough that new stories about the character are still being written.