Simplify the following text for a Grade 10 native English-speaking person.
Original: Confident that they will not find any evidence of the murder , the narrator brings chairs for them and they sit in the old man 's room , right on the very spot where the body is concealed , yet they suspect nothing , as the narrator has a pleasant and easy manner about him .
Simplified: When the narrator reports that the police ( whether a delusion or real is unclear ) respond to a call placed by a neighbor who heard a distressful scream , the narrator invites them to look around , confident that they will not find any evidence of the murder . They sit around the old man 's room , right on top of the very hiding place of the dead body , yet suspect nothing .