 It was the sixth collection of Derleth's Solar Pons stories which are pastiches of the Sherlock Holmes tales of Arthur Conan Doyle.The story "The Adventure of the Haunted Library" features a tribute to the William Hope Hodgson character Carnacki the Ghost-Finder, who is said to have initially investigated the case before passing it on to Solar Pons.Derleth published the first American (and first expanded) edition of "Carnacki, the Ghost-Finder" under his Arkham House imprint.