At the northern tip of Japan lies an architectural marvel known as the Crooked House, a large mansion built at a slight angle. It is the home of wealthy businessman Hamamoto Kozaburou, his daughter and some servants. One Christmas he invites some business associates to spend the holidays at the Crooked House. Unfortunately, the festivities are brought to a halt when corpses start turning up inside locked rooms.
Several years ago, there was a murder mystery game show called Whodunnit? that ran for a season. It was entertaining to watch, but it was far too removed from actual detective fiction to provide much satisfaction as a mystery. As it turns out, two tie-in books written by show creator Anthony Zuiker were released at about the same time: Murder in Mystery Manor and Murder on Mystery Island. They are... pretty much the exact same as the TV show, down to format and flaws.