Summarize Chapter 3 of the book "And Then There Were None"
In Chapter 3 of "And Then There Were None" by Agatha Christie, the guests at the secluded Soldier Island have assembled in the drawing-room after dinner. The mysterious host, U.N. Owen, is absent, and the guests discuss the invitation they have all received, which seems to have been designed with their personal secrets in mind. Justice Wargrave is asked about his well-known reputation for delivering death sentences, and he admits that he has always believed in the justice of each case.
Mr. Blore shares his suspicion that the host might be one of the guests hiding their true identity, which the others already suspect. Dr. Armstrong defends himself by stating that he had doubts about the case that led him to the island, and he believes the host may be testing their consciences. The tension rises when Rogers, the butler, delivers a gramophone record that accuses each guest of being a murderer without having faced justice.
As the guests react to the accusation, they discover that they all share a common connection: they have all been involved in cases of murder, whether directly or indirectly. The guests begin to doubt each other, realizing that anyone present might be the murderer, and they resolve to leave the island in the morning. They also agree to keep watch over one another to ensure their safety. As they retire to their rooms, each guest feels a growing sense of unease and suspicion, uncertain of whom to trust in this isolated and dangerous situation.