Denice was in her 30's, but looked younger. Sherlock looked around the room to pick out anything. There was a picture of Denice and her poodle, Twinkie on the mantelpiece. There was also a picture of Twinkie as a small puppy on the bookshelf which had far too many books squeezed in. She started to tell her account. "I just heard this... Barking from behind me. I recognised Twinkie's bark instantly, but then he just started biting me... And then a man came up behind me and started swinging this knife around. So I ran and called the police, like anyone would. Unfortunately, he was never caught."
"Did you see the attacker's face?" Joan inquired.
"No, he was wearing a balaclava."
"Can you tell us anything about him?" Joan persisted.
"No, sorry."

Sherlock examined the picture of Denice and Twinkie. "Why did Twinkie end up in Baskerville?" he asked. Denice paused and swallowed before continuing. "She got lost about a year before the pound closed down. Luckily, I went there the next day and found her there. Then about a month later, I noticed her getting more and more aggressive. If I took too long to give her her dinner, she'd starting snapping at me. So, when the Pound had about three weeks before it was closed down, I gave Twinkie to them again and didn't see her again until the attack." Sherlock looked around the room again, his eyes kept stopping at the bookshelf. He glided over to it quickly and ran his hands along the tops of the books. Denice looked panicked, "I think you need to go now."
"Come on Denice, we only just got here. Tell me about this bookshelf. How old is it? When and why did you get it? Which book opens the secret door?"
"Get out of my house or else I'll call the police."
"We are the police." Sherlock's hand stopped at one book. He looked at Denice with an expectant smile, not moving his hand. Still looking at Denice, Sherlock pulled back the book. The bookshelf slid sideways slowly, and there in the space where the bookshelf was, a man was chained to a chair with ripped clothing and scars on his body.

"Anthony was the real reason for Twinkie being taken to Baskerville. They had been struggling to make enough money to keep caring for the dog, so Anthony gave it in. Denice has since been keeping him barely alive just enough to torture him, and in the words of the walls of his cell, 'like the way Twinkie was', which doesn't sound so menacing when you add the dog's name."
"Sherlock, why was Baskerville closed in the first place?" Joan asked.
"Come on Joan, surely you know the old ghost story of the Baskerville Pound?"
"No, because I don't spend my free time arguing with conspiracy theorists on the internet."
"Baskerville Pound was closed on charges of animal torture in strange experiments. In this sort of case, usually the remaining dogs would be put down just before the closing of the Pound. However, at the last minute, every remaining dog was purchased by one mysterious buyer. Unfortunately, the doctor who was revealed to be the main perpetrator of the torturing, Dr Jack Stapleton, also disappeared somewhere around the same time. So, popular speculation is that he was the one who bought the dogs and to this day continues his sick experiments." Sherlock explained.
"So, what's the ghost story?"
"The ghost story is that the ghosts of the dogs who died in the experiments stick around the Pound and are ready to seek revenge on anyone who goes near."
Gregson chimed in, "Well hopefully we don't encounter them in the search of Baskerville Pound."
Sherlock then speculated, "But is it the ghost of the dogs, or Dr Jack Stapleton?"