Summarize chapter 9 of the book "And Then There Were None"
Chapter 9 of "And Then There Were None" begins with the guests on the island growing increasingly paranoid and suspicious of one another. Each character is haunted by their past crimes, and tensions rise as they try to figure out who the murderer is among them. They also wonder if one of them is involved in orchestrating the entire situation.
Justice Wargrave takes charge of the situation and tries to maintain order among the group. He suggests they stay in their rooms during the evening to ensure everyone's safety. However, during dinner, Emily Brent dies suddenly after being stung by a wasp. The remaining guests suspect foul play.
Amidst the chaos, Justice Wargrave reveals his plan to bring justice to the guests. He believes that they are all guilty of murder, and he has invited them to the island to face the consequences. He confesses to being the mysterious U.N. Owen, the person who lured them all there.
As panic ensues, Vera Claythorne realizes that the nursery rhyme, "Ten Little Indians," reflects the murders taking place on the island. One by one, just as the rhyme suggests, the guests are dying according to a pattern. They begin to suspect that the murderer is among them and is using the rhyme as a guide.
The chapter ends with Dr. Armstrong discovering that Justice Wargrave has died by a gunshot wound to the head, seemingly self-inflicted. The guests are left horrified and bewildered by the revelation of U.N. Owen's identity and the violence that continues to unfold on the isolated island.