Let me ask about the word I'm not sure about its meaning from The Golden Pince-nez by Conan Doyle.
As I turn over the pages, I see my notes upon the repulsive story of the red leech and the terrible death of Crosby, the banker.
What I want to know is whether the word "red leech" here refers to animal leech or a person. Anything can happen in Holmes universe so it could mean literally animal leech whose body color is red. But for me it looks a bit strange. I found the term "leech" could indicate a certain type of person which is.. a person who gives attention to someone over a long period in order to get their money or support, then the readers should take this word as so? That is the red-headed scum who may have killed the banker Crosby? The term "red leech" here is ambiguous even for native speakers too? Or is there any way you can judge which is which? Thanks.