The next morning…

"Alright." Dean glared as he sipped his coffee after getting out of the Impala, "What are we doing here at 5:30 in the morning?"

"I realized something." Sam explained, "The videotape shows the killer going in, but not coming out."

Dean leaned against the hood of his car, "So, he came out the back door?"

"Ah…" Angel nodded, "You're looking for a trail."

"A trail the police would never pursue."

"Right…" Angel nodded, "Cause, to them, the killer never left. They caught him inside."

Dean rolled his eyes, " still don't know what we're doin' here at 5:30 in the morning."

Sam ignored him as he looked around the outside of the building, and noticed blood smeared on a nearby telephone pole, "Blood. Somebody came this way."

"Yeah, but the trail ends." Dean pointed out, "I don't see anything over here."

An ambulance sped past them, and they exchanged looks before following it. Once at the house, they observed the scene quietly from a couple feet away. They watched as the police handcuffed a man and put him in the back of a squad car. Angel left them for a few seconds to talk to one of the neighbors at the scene.

Once she came back Dean regarded her, "What happened?"

"Neighbor said he tried to kill his wife. Tied her up and beat her." Her eyes cut to Sam, "Also said she thought he was a nice guy. Always waved hello and smiled at her in the morning."

Later on…

Sam stood outside of the house as he looked around. He looked inside two garbage cans but didn't find anything. He moved to the front of the house where Dean and Angel came up behind him.

"Okay…" Dean huffed and looked to Sam once he turned around, "Remember when I said this wasn't our kind of problem?"

"Yeah?"

"Definitely our kind of problem."

"What'd you guys find out?"

"We just talked to the patrolman who was first on the scene to hear this guys story." Angel crossed her arms, "This Alex guy was in the middle of driving home from a business trip when his wife was attacked."

"So, he was in two places at once."

"Exactly." Dean continued, "Then he sees himself in the house, police think he's a nutjob."

Sam's brows furrowed as he thought, "Two dark doubles attacking loved ones in exactly the same way…"

"No, i think it's the same thing doing it." Angel eyed them grimly, "I think we're dealing with a shifter."

"Shapeshifter?" Angel nodded and Dean shrugged, "Something that can make itself look like anyone?"

"Every culture in the world has a shapeshifter lore." Dean explained, "You know, legends of creatures who can transform themselves into animals or other men."

"Right, skinwalkers, werewolves…"

"And right now we've got two attacks within a few blocks of each other so…" Angel shrugged, "We probably got a shapeshifter prowling around here."

"Let me ask you guys something…" Sam looked between them, "In all this shapeshifter lore, can any of them fly?"

Dean and Angel frowned as they looked at eachother, "Uh, I don't think so…"

"Not that I know of."

Sam turned with a sigh, "I picked up a trail here. Someone ran out the back of this building and headed off this way."

"Just like your friend's house."

"Yeah." Sam nodded, "And, just like at Zack's house, the trail suddenly ends. I mean, whatever it is just disappeared."

"Well, there's another way to go." Dean motioned, "Down."

They all looked down and noticed a manhole.

Angel groaned, "Great."

In the sewer…

"I bet this runs right by Zack's house, too." Sam said once her climbed down last, "The shapeshifter could be using the sewer system to get around."

"I think you're right. Look at this."

Dean motioned them over to look down and examine a pile of blood and skin on the ground. All three of them had equal looks of disgust on their faces.

"Oh god…" Angel put a hand over her mouth as Dean took out a pocket knife and held up some of the slimy skin, "Thats just fucking wrong. Is that from its victims?"

"You know, I just had a sick thought." Dean grimaced as he looked over to them, "When the shapeshifter changes shape- maybe it sheds."

Sam grimaced as Dean put the skin down, "That is sick."

Back at the car…

"Well, one thing i learned from dad." Dean opened the trunk and started taking out weapons, "No matter what kind of shapeshifter it is, there's one sure way to kill it."

Sam smiled as he watched them ready their weapons, "Silver bullet to the heart."

Angel smirked as she slid one of her silver knives into its sheath, "Doesn't gotta be a bullet, Sammy."

Sam's phone rang and he quickly answered it, "This is Sam… We're near Zack's, we're just checking some things out." He frowned after a second, "What are you talking about?"

Angel sent an eye to Dean, "Uh oh…"

"It's probably nothing."

Sam scoffed, "Why would you do that? Beck- We're trying to help."

Angel shook her head, "I take it we've been made."

Sam frowned again, "Beck, I'm sorry, but-"

Dean looked him over when Sam shook his head at being hung up on, "I hate to say it-"

"Then don't, Dean." Angel warned, seeing in Sam's face he wasn't in the mood, "Just leave it alone."

He carried on turning back to Sam, "No because that's exactly what I was talking about. You lie to your friends because if they knew the real you, they'd be freaked. It's just- it'd be easier if-"

"If I was like you?"

"Hey, man, like it or not, the three of us aren't like other people. But I'll tell you one thing. This whole gig." He held out a gun to Sam, "It ain't without perks."

Sam took it and put it in the back of his jeans before they walked away.

Back in the sewer…

The three Winchesters each made their way around the sewer, flashlights shining and guns at the ready.

Dean looked back, "I think we're close to its lair."

Angel looked to him, "Why do you say that?"

He motioned ahead to Sam, "Because there's another puke-inducing pile next to Sam's face."

Sam shuffled back when he turned and saw another pile of blood and skin on a nearby pipe, "Oh, God."

Angel grimaced, "Ew, it's on your jacket now." She motioned to another area where yet another pile of bloody skin and clothes laid, "I'm thinking it's lived here for awhile, boys."

"Who knows how many murders he's gotten away with." Sam turned and tensed when he saw the shapeshifter, still in the form of the man from before, standing directly behind Angel and Dean, "Guys! Watch out!"

They both whirl around to find the shifter there. He flung Angel against the pipes before punching Dean in the face and taking off. Both Winchesters fell to the ground as Sam shot at the thing but missed.

He moved over to them quickly, "You guys alright?"

Angel grimaced and put a hand to her head where she fell but no blood was present, "Yeah."

Dean got up with a grunt, holding his shoulder in pain and anger, "Get the son of a bitch!"

They quickly followed it to an open storm drain and climbed out, but when they came up it was already gone.

"Shit." Angel looked around, "We need to split up. We can cover more ground." She looked between the boys, "You two go around the sides ill cover the opposite. We'll meet in the middle."

They all walk in separate directions with their guns drawn. Angel hears a person approaching and instantly raises her gun. The frightened passerby stops with his hands up before turning and sprinting away in fear. She continues her search frantically before whirling around at her brother's voice.

"Anything?"

She shook her head, "Not on my end. I'm assuming not on yours either."

"No." Sam scowled, "He's gone."

"Alright." Dean motioned, "Let's get back to the car."

Sam and Angel cross the street before Dean stopped and waited for another car to pass. As it does, Deans eyes glowed silver momentarily but neither Angel nor Sam noticed.