Judy wrote in with this question:What is a “closed room mystery?” I came across this term in the blurbs for the ARC of The Girl With the Dragon Tattoo by Stieg Larsson, which I have been assigned to read for a certain project.I googled the term and got some hints, such as that all the suspects are in one room, but not an actual definition. The term is used in all kinds of reviews and critcism and I would like a definitive definition, if you know what I mean.Judy, imagine you and five other writers are at a retreat on a remote estate working on your books, and then, one day, promising young novelist Jonathan Foster Gatsby turns up dead. As you and the other four remaining residents of what is now seeming like an awfully remote piece of real estate stand over the body, a chilling fact dawns on you and your colleagues: everyone in the room is the suspect. Luckily you have a knack for detective work, and following a few clues (and sidestepping a couple more dead bodies), you determine that it was the soft-spoken Zelda Eyre that did it.That is a very hasty and very silly example of a “closed room mystery.” Essentially, from the moment the mystery commences, every character in the book is a suspect, and typically some form of isolation precludes the notion that the culprit came from outside this group. Millions contributor Emily suggests some examples: [Agatha Christie’s] Murder on the Orient Express or And Then There Were None (originally titled Ten Little Indians) or the boardgame Clue.