The book is divided into three sections. Chapters 1-10 provide the exposition, giving us all the background information we need to understand the action of the story. Chapters 11-20 are the rising action leading up to the climax. Chapter 11 begins with Edmund following Poe/Dupin to Mrs. Whitman's house because he's unsure whether he can trust Poe/Dupin. Poe then goes to the First Unitarian Church where he finds clues in the bell tower, and then Poe goes to Mrs. Whitman's house. The next few events give us clues to solve the mystery that involves Catherine, Mrs. Whitman's maid, Mr. Arnold, the man who also wants to marry Mrs. Whitman, and a man who follows Edmund to the pier. When Edmund finds Poe, Edmund gets mad at him because Poe won't answer his questions. Poe then explains everything to Edmund, and they go back to the room. The rising action ends when Edmund decides to go down to the pier by himself because Poe and Throck are asleep. Edmund sees Sis, his sister, on Rachett's boat, but Rachett hits Edmund. Poe and Throck find Edmund knocked out, and the three of them jump on a boat and chase Rachett and Peterson across the water. The climax occurs when Sis jumps in the water, and Edmund jumps in to save her. The remainder of the book is the falling action and the resolution.