Question: What genre, usually involving a mysterious death, is exhibited by a book who features detective Sir Henry Merrivale?

full_context: Document 1: Sherlock Holmes: Sherlock Holmes ( ) is a fictional private detective created by British author Sir Arthur Conan Doyle. Known as a "consulting detective" in the stories, Holmes is known for his proficiency with observation, forensic science, and logical reasoning that borders on the fantastic, which he employs when investigating cases for a wide variety of clients, including Scotland Yard.
Document 2: The Decagon House Murders: The Decagon House Murders is a 1987 Japanese mystery novel and was the debut work of author Yukito Ayatsuji. Borrowing its basic plot structure from Agatha Christie's "And Then There Were None" (Christie's book is directly referenced by some of the characters at several points), it tells the story of a group of seven university students who travel to a deserted island that was the scene of a grisly mass murder six months earlier, where events soon turn ominous. "The Decagon House Murders" belongs to the honkaku subgenre of mystery fiction.
Document 3: Mystery fiction: Mystery fiction is a genre of fiction usually involving a mysterious death or a crime to be solved. In a closed circle of suspects, each suspect must have a credible motive and a reasonable opportunity for committing the crime. The central character must be a detective who eventually solves the mystery by logical deduction from facts fairly presented to the reader. Sometimes mystery books are nonfictional. "Mystery fiction" can be detective stories in which the emphasis is on the puzzle or suspense element and its logical solution such as a whodunit. Mystery fiction can be contrasted with hardboiled detective stories, which focus on action and gritty realism.
Document 4: Murder in the Submarine Zone: Murder in the Submarine Zone (also published as "Nine—And Death Makes Ten" and "Murder in the Atlantic") is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunnit and features the series detective Sir Henry Merrivale.
Document 5: Legal drama: A legal drama or a courtroom drama is a subgenre of drama and crime fiction. Law enforcement, crime, detective-based mystery solving, lawyer work, civil litigation, etc., are all possible focuses of legal dramas. Common subgenres of legal dramas include detective dramas, police dramas, courtroom dramas, legal thrillers, etc. Legal dramas appear in many forms of media, including novels, plays, television shows, and films. Legal drama sometimes overlap with crime drama, most notably in the case of "Law & Order". Most crime drama focus on crime investigation and does not feature the court room. An early example of this overlapping form was Erle Stanley Gardner's Perry Mason, in which the eponymous trial lawyer would usually defend his clients from their murder charges by investigating the crime before the trial, and dramatically revealing the actual perpetrator during the closing courtroom scene, by calling some other person to the stand and interrogating him or her into confessing in open court:
Document 6: The Curse of the Bronze Lamp: The Curse of the Bronze Lamp (also published as "Lord of the Sorcerers") is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a locked room mystery or, more properly, a subset of that category known as an "impossible crime", and features the series detective Sir Henry Merrivale. Carr considered this one of his best impossible crime novels.
Document 7: The Reader is Warned: The Reader is Warned is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunit and features the series detective Sir Henry Merrivale.
Document 8: Mystery (novel): Mystery is a 1990 novel by American author Peter Straub, and is the second installment in Straub's loosely connected "Blue Rose Trilogy". The novel falls into the genre of crime fiction, and was preceded by "Koko" and followed by "The Throat". The book was published by Dutton, won the 1993 Bram Stoker Award and was a 1994 WFA nominee
Document 9: Death in Five Boxes: Death in Five Boxes is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunnit and features the series detective Sir Henry Merrivale and his associate, Scotland Yard's Chief Inspector Humphrey Masters.
Document 10: The Gilded Man: The Gilded Man (also published as "Death and the Gilded Man") is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunnit and features the series detective Sir Henry Merrivale.
Document 11: Cluedo: Cluedo ( )—known as Clue in North America—is a murder mystery game for three to six players, devised by Anthony E. Pratt from Birmingham, England. The game was first manufactured by Waddingtons in the UK in 1949. Since then, it has been relaunched and updated several times, and it is currently owned and published by the American game and toy company Hasbro. The object of the game is to determine who murdered the game's victim ("Dr. Black" in the UK version and "Mr. Boddy" in North American versions), where the crime took place, and which weapon was used. Each player assumes the role of one of the six suspects, and attempts to deduce the correct answer by strategically moving around a game board representing the rooms of a mansion and collecting clues about the circumstances of the murder from the other players.
Document 12: My Late Wives: My Late Wives is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunnit and features the series detective Sir Henry Merrivale and his long-time associate, Scotland Yard's Chief Inspector Humphrey Masters.
Document 13: Night at the Mocking Widow: Night at the Mocking Widow is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson . It is a whodunnit and features the series detective Sir Henry Merrivale.
Document 14: And So to Murder: And So to Murder is a mystery novel by the American writer John Dickson Carr (1906–1977), who published it under the name of Carter Dickson. It is a whodunnit and features the series detective Sir Henry Merrivale and Scotland Yard Chief Inspector Humphrey Masters.
Document 15: The Act of Roger Murgatroyd: The Act of Roger Murgatroyd: An Entertainment is a whodunit novel written by Scottish novelist Gilbert Adair first published in 2006. Set in the 1930s and written in the vein of an Agatha Christie novel, it has all the classic ingredients of a 1930s mystery and is, according to the author, "at one and the same time, a celebration, a parody and a critique not only of Agatha Christie but of the whole Golden Age of English whodunits", but also "a whodunit in its own right, so that those readers who were completely uninterested in literary games of the so-called postmodern type could nevertheless settle down comfortably with a good, gripping and intentionally old-fashioned thriller". "The Act of Roger Murgatroyd" is also a locked room mystery.
ground_truth: Mystery fiction