In the mystery novel The Westing Game by Ellen Raskin, the murderer is revealed to be Julian R. Eastman, who is also known as Samuel W. Westing. The story revolves around a group of heirs who are brought together to solve the mystery of Samuel Westing’s death and to claim his inheritance.
Throughout the novel, Westing fakes his own death and assumes various disguises to observe the heirs as they try to solve the puzzle he has set for them. The twist is that Westing himself orchestrated the entire game to find a worthy heir and to bring the group together. In the end, it is revealed that Westing is alive and that there was no actual murder. The game was a test to see who could solve the mystery and inherit his fortune.