A/N: Hello my lovelies! Thank you so much for checking this story out :) I've had this stupid idea for an AU in my head ever since I re-watched 'The Rapture' (4x20) and I wrote this story within a week XD You might have to bear with me on this one. This is the first in a series of stories that I have plotted for this AU. So I hope you like it!

Reviews would be amazing if possible :) xx

Castiel Novak sighed deeply as he straightened his tie in the mirror. It still didn't look right and this nervousness was starting to bug him. That day would be his first working as a Doctor at St James hospital in Pontiac, Illinois.

He wasn't usually one to be concerned about making good first impressions, preferring to get his work done with little distraction from other people, but this could very well be the start of the rest of his working life so it was perhaps better to make more friends than enemies. Unfortunately, his people skills were rather rusty and medical school had been a rather lonely time for Castiel, but he didn't mind. Most of his patients would thankfully only expect a professional relationship, but he still had some work to do on his bedside manner.

He started to reposition his collar again when there was a knock on his apartment door. Castiel frowned as he went to answer it; he hadn't been expecting anyone, but then again there was only one person it could possibly be.

Sure enough when he opened the door his identical twin brother, Jimmy, was stood with a huge grin on his face.

"So, today's the day!" Jimmy announced eagerly and entered the apartment without an invitation first. "I can't believe it. Little Cassie is really going places in the world!"

Castiel couldn't help but roll his eyes at his brother's unnecessary eagerness.

"I'm not an infant on my first day of school, Jimmy. I'm just going to work as a doctor."

"Just a doctor?" Jimmy repeated with disbelief. He placed his hands on his brother's shoulders so that their matching crystalline blue eyes met. "Doctors are healers, Castiel. Actual miracle workers! Mom and dad obviously knew something this great would become of you. You are the one named after an angel after all!"

Castiel fought the urge to roll his eyes. "Would you please stop saying that? Mother and father loved us equally. Additionally, you know I detest being called Little Cassie. It's Castiel and we are twins, Jimmy. You are only approximately twenty minutes older than me."

"And don't you ever forget it" Jimmy said pointing at Castiel with a stern look. This time the younger twin did roll his eyes. "C'mon, this is exciting!" Jimmy said clapping his brother on the back.

"It is?" Castiel countered.

"Yes" Jimmy said firmly as he sorted out his twin's shirt collar for him. "You are going to be incredible, and meet lots of new people…make some new friends…"

"I don't know that…"

"Ah-ah-ah" Jimmy placed a finger on Castiel's defiant lips. "You really need to work on your self-esteem, Castiel. You are an amazing guy and people will love you if you let them get to know you."

Castiel remained silent for a moment and waited for Jimmy to take a step back.

"I'll try" the younger twin mumbled.

Jimmy didn't seem to be filled with confidence as he gave his brother a dubious look before pulling Castiel into a tight hug and going in to smother hen mode. Castiel grimaced and stood awkwardly with his arms pinned to his side.

"Have you got lunch? Remember to stop and eat at some point" Jimmy fretted. "Promise to call me when you have a break later on and tell me how it's going."

"I promise. I'll be fine" Castiel said as he gingerly patted his brother on the back.

Jimmy had been protective of Castiel since they were small children. Castiel had always struggled more with emotions and social interaction than his brother. Jimmy was popular at school whereas Castiel could always be found sat alone in a corner with a book. Jimmy worried that his brother was lonely or depressed no matter how many times Castiel insisted he didn't mind his own solitude. He wished Jimmy wouldn't worry, the older twin had a busy life of his own now, but if all his fussing made his brother feel more at ease then Castiel would allow it.

"Alright. Good." Jimmy finally released his brother and stepped back again. "Well, I better be off to work too."

"Okay, I will call later. Say hello to Amelia for me."

Amelia was Jimmy's new wife. They had been high school sweethearts; quite poetic really. They had only been married a month so Castiel had hoped Jimmy's attention had been diverted, but Amelia seemed to be favourably condoning of the brother's close relationship. She was truly a lovely woman and Castiel was glad Jimmy had found her; he deserved the happiness they had together.

"I will. Good luck!"

Jimmy waved as he headed out the door and Castiel watched him go. The younger twin headed back inside and looked in the mirror once more.

He was as ready as he was ever going to be.

By the end of his shift Castiel was feeling exhausted. He knew that the work would be tough and heavy but he had no idea he would be assigned so many patients already. He hadn't even had the time to sit down for a coffee or hold a meaningful conversation with his colleagues; just handing out orders to the nurses and talking diagnosis and treatments with his patients.

He pulled the stethoscope off from around his neck and sat down with a heavy sigh at his desk for the first time only an hour before his shift ended. He ran a hand through his hair and looked at all the forms and paperwork he still had to complete before he went home – it looked like he would be working overtime on his first night.

Castiel had forgotten about his promise to call Jimmy until his phone started ringing and his brother's number flashed across the screen.

"Hello, Jimmy" Castiel answered a little cautiously.

"Cas! How is everything going? Are you doing okay?"

"Everything has gone fine so for, Jimmy. I've just been really busy. Please don't worry so much."

"I know. I'm sorry. Did you remember to eat?"

Castiel cringed slightly. No, he hadn't eaten since breakfast and it was nearly 10pm. His day had been demanding and he did just forget sometimes.

"Castiel!" Jimmy scolded.

The doctor looked out into the hall through the glass window as he tried to think of a way to subdue his brother, but he was distracted when two men in suits walked by.

One of them was extremely tall with long hair swept back behind his ears. The other man was smaller with short sandy hair. The shorter man turned to look through the window as he walked by and his eyes momentarily met Castiel's.

The doctor's breath caught. The man had the most striking green eyes he had ever seen and freckles that perfectly complimented his complexion. Castiel thought he was beautiful. The smile the man shot him as he passed was crooked with an edge of mischief and seductiveness. Castiel's mouth twitched up at the edges as he thought about returning the gesture but the men were already gone.

"Castiel!? Are you still there?" Jimmy's slightly annoyed tone broke through Castiel's pensiveness.

"Oh, yes, sorry. I have to go. I'll come over tomorrow and tell you all about it, okay?"

"Okay" Jimmy sighed. "Good night. Eat!"

"I will" Castiel promised before he ended the call.

He quickly got up and rushed into the hall to see if he could catch up with the men but they had already gone around the corner. He strode down the corridors looking in every room where the men might be. At the end of one of the halls he realised that a small group of people had gathered. Curious, Castiel walked over and found that the area had been cordoned off with crime scene tape and there was an officer stood at the door.

Castiel made his way to the front and peered into the room. His eyes widened when he saw a woman's body lying on the floor. She was surrounded by blood which was oozing from a wound in her abdomen. More disturbingly the body was clearly that of a doctor. She was wearing scrubs with a long white coat and her stethoscope was strewn across the floor.

His view was cut when the shorter man from earlier stepped out from the room and headed over to him.

"Hey, it's probably best you don't look in there" he warned. His voice had a rough edge; it was quite endearing.

"I'm a doctor. I've been around blood all day if that's what you are concerned with" Castiel pointed out.

"Yeah, but this is a colleague" the man said.

"Oh, this is my first day, I don't think I've even seen her before" Castiel said. "Still, it's very tragic" he quickly added. His naivety to certain emotions caused him to come off cold sometimes but that was never his intention. The man didn't seem fazed though. "Are you with the police?" Castiel asked.

"Not exactly. I'm agent Bond, FBI" the man said as he pulled out his badge and showed it to Castiel.

"Doctor Novak" Castiel replied.

"Did you happen to see anything suspicious or out of the ordinary earlier tonight, Doctor Novak?"

"No. I've been with patients all day and then sat in my office for the past hour or so."

"Okay, well, if you do see anything strange over the next couple of days I want you to call this number."

The agent handed over a card and then left when his partner called him over. Castiel ran a thumb across the phone number a few times before putting the card safely in his inside pocket.

He turned and headed back to his office.