Later, they reached their destination: the House of Usher. It resembled a medieval stronghold only it was spruced up to more resemble a monastery/house. They walked inside to see the owner of the house, Roderick Usher.
"Delighted to see you Mr. Holmes and Mr. Watson," Roderick said. "I would have reached you sooner but the weather was terrible around here."
"Actually, Mr. Watson is on vacation right now; this is Mr. Peter Griffin."
"I see," Roderick said looking at Peter skeptically. "Do you have any experience with solving mystery before?" he asked Peter.
"Well, there was this one time where my mayonnaise disappeared and I had to find out what happened to it, but then it turned out that I ate the mayonnaise and I threw away the jar."
"Indeed," Roderick said with a look of disgust in his face.
"Anyways," Sherlock said, trying to get away from Peter's disgusting habits, "You said that your sister was murdered, may we see where the incident took place?"
"Why certainly," Roderick said, "so long as you don't touch anything." Roderick said this seeing Peter touching all of his stone busts on his bookshelves.
"Lead the way, Mr. Usher," Sherlock said and Roderick led the two of them to his study.
In the middle of the study, there was a cloth with a lump lying under it. "If I'd known that we were going to have a picnic, I would've brought my basket," Peter said as he lifted the cloth up revealing Ms. Roderick's cadaver. "Sweet Mother of Pee-Wee Herman!" Peter exclaimed.
"That's why I said," Roderick began, as he took the cloth from Peter's hands and covering his dead sister up with it, "'don't touch anything.'"
"I can't help but wondering," Sherlock began saying, "that your sister has light brown hair whereas you have dark brown hair. The possibility of you and your sister having different hair colour is…well, in simple terms (for Peter's sake) pretty nil."
"Well I can explain…" Roderick began.
"What I can deduce is that this girl isn't your sister or you are not Roderick Usher," Sherlock added.
"I guess you are the master," Roderick said reluctantly.
"I'm not finished yet," Sherlock said, "also you both have, from what I have seen, the same eye colour which is also a rare trait unless she was your twin. Even if she was your twin, she would have the same hair colour as you anyway."
"You certainly eliminate the obvious, Mr. Holmes," Roderick said.
"I also have something to add," Peter said.
"You do?" Holmes and Roderick asked in unison.
"Yes if this guy is who he says he is, then why is there a zipper in the back of his head?"
"A zipper?" Holmes asked.
"A what?" Roderick asked.