William Hope Hodgson 
Carnacki, the Ghost Finder (Annotated) [EPUB ebook] 

• This edition includes the following editor’s analysis: The sea as the origin of horror, an indispensable mark of William Hope Hodgson’s literature

First published in 1913, “Carnacki, the Ghost-Finder” is a collection of occult detective short stories by English author William Hope Hodgson, featuring the titular protagonist.
“Carnacki, the Ghost-Finder” presents us with intriguing detective stories in which the great Thomas Carnacki investigates the supernatural using scientific tools, such as photography, and tools that are augmented by theories of the supernatural, such as the electric pentacle, which uses vacuum tubes to repel supernatural forces.
Carnacki can be described as the Sherlock of the occult world.