What is the body in the library sleuth?

The Body in the Library is a detective novel by Agatha Christie that was first published in 1942. The novel features the popular fictional detective Hercule Poirot and his friend, fiction writer Ariadne Oliver, who investigate a murder in which a young girl's body is found in the library of Colonel Arthur and Dolly Bantry's stately home.

The sleuths start their investigation by trying to identify the victim and the possible suspects. They discover that the girl, Ruby Keene, was a dancer at a hotel owned by Conway Jefferson, a wealthy businessman who has recently lost his wife and daughter. Ruby had been living at the hotel with her aunt, who has been missing since the night of the murder.

As the investigation proceeds, Poirot and Oliver uncover several clues and suspects, including an American businessman, a young man who is obsessed with Ruby, and a jealous rival of Ruby's. They also find out that Ruby was involved in a sinister plot of blackmail and forgery, which eventually leads them to the killer.

Throughout the novel, Christie brings attention to the social norms and morals of the time, including the double standards of society regarding women's behavior and the pitfalls of maintaining appearances. The novel's intricate plot and surprising twists have made it a popular and enduring work of detective fiction.