The Westing Game, by Ellen Raskin, was published in 1978 by Dutton.
This highly inventive mystery involved sixteen people (including a dressmaker, a secretary, an inventor, a doctor, a judge, a bookie, a burglar, and a bomber) who are invited to the reading of the very strange will of the very rich Samuel W. Westing. They could become millionaires, depending on how they play the game. All they have to do is find the answer—but the answer to what? The Westing game is tricky and generous, but the heirs play on—through blizzards, burglaries, and bombings. Ellen Raskin has entangled a remarkable cast of characters in a puzzle-knotted, word-twisting plot filled with humor, intrigue, and suspense.