NOTE: I am NOT affiliated with the following source:
Arthur Conan Doyle: The Hound of Baskervilles
https://a.co/d/7tNXZv6

SEXUAL CONTENT
• The villain of the story is inferred to have several sexual partners
• The villain of the story promises marriage to advance his plans
• The plot revolves around a family tragedy where a woman was kidnapped by a villainous group of men, (the idea of rape is alluded to).  She escapes the men, but ultimately falls to her death

VIOLENCE
• Very little violence is directly described, however, much is alluded to
• This is a murder-mystery.  While the murder does not happen in-text the entire plot revolves around the crime
• A character falls to his death.  His corpse is observed and his skull is described as crushed.
• A character is mauled by a giant dog (note: the mauling itself is not described)
• A vicious man-killing hound is killed
• Characters traverse through adventurous and life-threatening situations
• The plot revolves around a family tragedy where a woman was kidnapped by a villainous group of men, (the idea of rape is alluded to).  She escapes the men, but ultimately falls to her death

RACISM SEXISM AND SOCIAL NEGATIVITIES
• The story takes place in Victorian England.  Women are depicted as fragile while men are depicted as adventurous and intelligent.
• A side-character has a hobby of analyzing skulls and surmising the implications of their skull-shape.  This real-life historical practice was used to justify racism, which is even alluded to at one point in the novel!
• Usage of the word "n*gro" 
• Usage of the word "esk*mo"

PROFANITY
• h*ll

DRUGS/ALCOHOL
• Characters smoke excessively throughout.  
• Holmes smokes an abundant amount of tobacco because he believes it helps sharpen his mind