A woman walked into a room and there was a new picture there. She immediately knew someone had been killed. How? (The answer is below.) Puzzles like this, each centered on a mysterious murder, will grab puzzle-heads and won't let them go until they find the solution. Two or more can play the game, with one person reading the book and answering the other players' yes-or-no questions. Or solvers can fly solo, thanks to the carefully constructed clues revealed one by one in the text. (The picture was a chalk outline on the floor.)