Question: What does the narrator do with the dead man's body?
Answer: The narrator dismembers the body and carefully places it under a few floor boards in the old man's room. He's confident that his crime will not be discovered, even inviting the investigator to sit on a chair directly above the dead body.
Question: Why does the narrator want to kill the old man?
Answer: I'll let him tell you: "Object there was none. Passion there was none. I loved the old man. He had never wronged me. He had never given me insult. For his gold I had no desire. I think it was his eye! yes, it was this!" (172). Okay.
Question: The narrator visits the old man's bedroom every night for seven nights before killing him on the eighth night. What finally causes him to commit the act?
Answer: He hears the old man's heart. The narrator says, "It was the beating of the old man's heart. It increased my fury, as the beating of a drum stimulates the soldier into rage...the hellish tattoo of the heart increased. It grew quicker and quicker, and louder and louder every instant...I thought the heart must burst. And now a new anxiety seized me--the sound would be heard by a neighbor! The old man's hour had come!" (174-5). Okay.