The rising action was when the boy walked into the old man's room, for eight night's straight. Taking over an hour to slowly but quietly creep in. On the eighth night, the old man woke up and heard someone. He said "Who's there?". The boy thought, this is it, this is when I should kill him and the creepy old eye.
The boy suffocated the old man to death and had to hide the body. The only reason he killed the man is for his hideous eye, that bothered him so much. So the old man was cut to pieces in the tub, by the boy. Then he put the old man under the planks all cut up, and washed away the blood in the tub. "I finished, someone knocked at the street door."
At the door were three cops, saying they received a call about a scream coming from this house. "I smiled and invited them in", told them it was his scream from a nightmare and showed them around the house. They then came in the last room they haven't checked yet were the body was hidden under the planks. Finally the cops were done checking the house and continued to talk to the boy. The boy felt his heart beating and confessed the murder.