This long-running series places the reader in the middle of the action, seeing the story through the eyes of Taylor, a visitor to Montague Island, where a wealthy couple own a home to which they regularly invite guests to solve puzzles, compete in tournaments, and play murder-mystery games. Taylor poses as a guest while covertly investigating some suspicious events—and, over the years, becoming a close family friend. Mysterious packages with coded messages, maps, blueprints, dartboards, wedding plans, amusement parks, mosaics, and more will all come into play in puzzles ranging from simple to deviously complex, while Taylor unravels four mysteries woven throughout.