Definition of Logos
A skilled judge, Judge Wargrave assumes a position of authority over the group at various points of the novel, using logos to force them to confront the reality of their situation. His use of logos is evident when he reasons that the murderer must be one of the guests at the house, to the shock of Vera:
“Oh, no, no, no….” It was Vera who burst out—almost in a moan.
The judge turned a keen eye on her. He said: “My dear young lady, this is no time for refusing to look facts in the face. We are all in grave danger. One of us is U. N. Owen. And we do not know which of us. Of the ten people who came to this island three are definitely cleared. Anthony Marston, Mrs. Rogers, and General Macarthur have gone beyond suspicion. There are seven of us left [...] ” He paused and looked round. “Do I take it that you all agree?”