Clara and John were in front of a computer with men typing on its keys. It hit John that at the part where Patrolman Alice had been killed, the radio of his had suddenly gone haywire just before the feed cut out. At first he thought nothing of it but as the day he was having was becoming convoluted, he had an idea. John had the men isolate the audio, and put it through several programs, taking out the track playing and then some. Clara looked over to John, "What do you think?"

"I think there was a reason for the attack," John told her. She blinked, "What are you thinking?"

"I thought the flashlight wasn't the reason. But it dawned on me, when the Doctor and… Benedict encountered him he didn't attack them," John explained. Clara tilted her head, "He could've easily taken them like he done to Alice. So, why didn't he do it then?"

"Exactly, I was thinking that perhaps there was more to it than we thought. That some reason the thing chose to attack Alice and no one else," John fathomed. The men pulled their attention to the screen as they finished tidying up the audio. The man, Greg, on the right hit the playback button as Jory on the left turned up the volume:

"You… did… this… We… trusted… you."

John blinked. He glanced to Clara who merely stared at the screen. Greg typed on the keys and hit the playback button again:

"You did this. We trusted you."

"There's more to it," Jory commented. Greg nodded. Clara ran a hand through her brunette hair and looked at John, "It was talking."

"The ravens could talk too. That's how I found that evidence," John remembered. Clara held a hand under her chin, pondering. "What does this all mean?"

The men finished up and readied to play the final version:

"You did this to us, Alice. We trusted you. Why?"

"He knew him," John was stunned. Clara looked at the men, "Is there anyone we can talk to about Patrolman Alice?"

"Just Moya and Bradley," they answered. John rubbed his chin, "What does he mean, "You did this"?"

John and Clara left the room and tracked down Moya who was signing off on a supply run. She turned to them, "Patrolman Alice knew it?"

"Yeah, Greg and Jory isolated the audio. Do you have a record on Alice?" Clara asked her. She chewed on her lips, "I can't give out that sort of information."

"A man is dead. He knew his killer. We need to know how he knew him," John pointed. Clara nodded, "We need to know this. There are reasons to believe Alice was involved."

Moya sighed, "Bradley is the only one who has access to it."

"Then we'll get him," John turned and marched away. Clara hurried to keep up with him. They stopped when they spotted a scientist, Nick, holding a birdcage with a raven inside. The raven didn't have amber eyes like the others they've seen and it confused them. Clara stepped toward Nick and asked him, "What are you doing with a raven?"

"I'm sorry, um, protocols," Nick shook his head. John pointed, "It doesn't have amber eyes."

"Look, Grissom just wants to test a few theories is all," Nick hurried away with the raven cawing in the distant. Clara looked at John, "What theories?"

"Considering what our jobs' been like, anything," John sighed. They continued to wander until they found Bradley looking down on paperwork he was singing. He stopped when he looked up to them. John had his arms crossed. Clara was merely looking. "We need files on Patrolman Alice," John told him. Bradley stared, "Why do you want files for?"

"We have reasons to believe he knew the machine," Clara told him. Bradley tilted his head, confused. "What do you mean he knew it?" he asked. John told him what the men found in the segmented audio clip; he then stopped and shook his head, in disbelief. "Please, we have to know," Clara pleaded. Bradley looked down at his desk long and hard, rubbing his hazel eyes and running a hand through his graying hair before he glance dup and nodded. He gave them access to a restricted part of UNIT where files on all its employees resided. With an escort they were led to an elevator and the escort used his ID on the scanner to allow the elevator to go down further of UNIT.

On arrival, John and Clara were escorted to a large room with cabinets lining up, all in alphabetical order according to surnames. They were lead toward one cabinet where the escort opened and rummaged through until he dug out a file on Alice. He continued to lead John and Clara into a room and stood guard as they looked through the folder.

Patrolman Alice Walker, would've been sixity years years old next month had he lived, lived alone in a small flat in Essex. He had no known relatives or next of kin; he was an average man from the look of things. So far as it looked, there wasn't anything in his file that would indicate that Alice was involved in something. John ran a hand through his graying hair and sighed, "I don't get it. What are we missing here?"

"I don't know," Clara shook her head. She got to a paper with cross references of Alice's former employees and stopped. "Wait a minute, Lamb?"

John looked at her, "Lamb?"

"Sofia Lamb!" Clara pointed. John eyed her, "I don't even know who that is!"

"She's a scientist," Clara explained. John tilted his head, "She in my universe?"

"Oh, no, she never existed in it," Clara shook her head. John nodded. Clara continued, "She's a scientist who was working on a project."

"What happened?" John asked. Clara shrugged, "She just disappeared, and so did everyone she was working with."

"Except Alice," John glanced down. Clara nodded. John rubbed his eyes, "What was his occupation?"

"Um, it just says he was a guard," Clara flipped through the pages. John crossed his arms. He tilted his head, "I think this Sofia Lamb was working on more than just a project."

Clara sighed, "Maybe we can look her up?"

"That's the plan," John gathered to papers and stacked them back into the folder. He handed it back to the escort who checked to ensure everything was inside and when he concluded everything was accounted for he returned the folder to its respective cabinet. The escort led them to the elevator and took them back to the ground floor where they headed back to Greg and Jory. "Sofia Lamb—Alice worked for her?" Greg rubbed his chin. Jory shook his head, "Never told us that part at all."

"We think she's been doing more than a science project, you think you can dig up things about her?" John asked them. They proceeded to point at themselves. "There was a reason we were hired," they proclaimed. Clara nodded, "Do you think you can get anything that involves her project?"

"We can try, no promises," she heard the two said as they turned around to the computer and began to type vehemently on the keys. "Sofia Lamb," the two muttered under their breaths. Pictures of a woman in her mid-thirties popped up, she wore a white lab coat in almost all of them and a picture of her and ten others in lab coats appeared. Greg and Jory stopped when they found audio recordings from tapes. They disregarded them until they kept popping up relentlessly and then some. "I don't get it, why are audio recordings popping up?" Jory tapped on the keys. Greg shook his head, "Must be because of the relevancy filter. It's okay I can get rid of them with another filter."

John held up his hand. "Hold on, now, why don't you play the first one?" he asked. He was looked at. Jory shrugged, "Why not?"

Greg sighed, "I don't know. I think it's pointless."

"There had to be reasons for why the audio recordings are coming up, no?" Clara looked at them both. Greg sighed and tapped on the keys, when he finished Jory turned the volume up. The narrator was none other than late Patrolman Alice:

"This is Warden Walker and I would like to remind the Keepers on the behalf of the wonderful scientists of tomorrow to not allow the Alpha Series to wander the halls during the after-hours. We had multiple complaints coming in about the Alpha Series getting into trouble. In particular, to the Keeper of… uh… [Papers are being shuffled] Subject Delta; please keep your Subject in its enclosure. The scientists are complaining that Subject Delta has been altering some audio equipment and playing… [More papers being shuffled]… I don't know, some song called "The London Crow" and would like you to keep it away from the equipment from now on. And on another subject… subject… heh… uh but um, Keepers, please keep the Alpha Series out of the way on January 12th. There had been an odd infestation and there will be workers coming in and spraying so please keep the Alpha Series out of the way. That'll be it for today's laundry list and I'll be sure to come up with more in the next coming days. This has been Warden Walker, and good bye."

"There's an earlier audio recording," Jory looked at John. John looked at Clara and she nodded. John nodded, too. "Play it," he told Jory. The next narrator who came on wasn't Alice this, it was someone else:

"Okay people, its Warden Ryan and I won't keep you for long. Today's going to be a long and interesting day indeed. Tomorrow's going to be Halloween and the Big Wigs want more subjects than before. So for everyone's sake, we need all hands on deck. And no Taggart that doesn't mean you can skip out because you have a dentist appointment. You're having one tooth removed, not the whole damn set, so don't even try to do it. Anyway, the Big Wigs wants the Keepers on call for when the subjects arrive tomorrow. And for my sake and everyone else's please do not leave crumbs in the break room, the beetles are coming back again and He Who Shan't Be Named doesn't like paying for exterminators so please clean up after yourself. This has been Warden Ryan and would you kindly do as I asked?"