The bomber in The Westing Game is revealed to be Sam Westing himself, under the alias of the mysterious character known as the ‘Windy.’ Throughout the story, characters are led to believe that the bombings are committed by one of the heirs seeking to claim the vast fortune left by the deceased Westing.
As the plot unfolds, the various incidents involving the bomb serve to mislead both the characters and the readers. The true purpose behind the bombings is to test the heirs and to encourage them to work together in solving the mystery surrounding Westing’s will. Thus, while Sam Westing orchestrates the bombings in a strategic manner, he does so to gather his heirs and challenge them to uncover the truth, ultimately leading them to learn valuable lessons about themselves and their relationships with one another.