Whodunit topic

A whodunit or whodunnit (for "Who done it?") is a complex, plot-driven variety of the detective story in which the puzzle is the main feature of interest. The reader is provided with clues from which the identity of the perpetrator of the crime may be deduced before the solution is revealed in the final pages of the book. The investigation is usually conducted by an eccentric amateur or semi-professional detective. The locked-room mystery is a specialized kind of a whodunit. The "whodunit"... full article at wikipedia