The only sound that echoed in his ears was a constant beeping. He had no clue of where he was. The last thing he remembered was crying over some old photos of him and his family and then nothing. Absolutely nothing. Everything was dark, why was he surrounded by darkness? He realized his eyes were closed.

"Hey kid, welcome back." Voight's voice was heard in the room bringing him back to reality.

A room? What for? He figured out he was laid on a bed. A hospital bed. Oh boy, he needed some explanations. As soon as he adjusted to his surroundings, his eyes focused down to his arms.

"Do you remember what happened?" Voight spoke again.

"No…" Jay talked for the first time since he woke up.

"You were shot; do you remember that?"

His eyes widened. Everything came to his mind right away. His father being killed in the fire, him down on the ground gasping for air after the bullet got his side and his boss yelling at him. He tried to sit up but the pain pinned him down.

"Take it easy, kid."

"My father, my father…" He whispered again and again. "Will, where's Will?" He shouted attempting one more time to get up. "I missed my father's funeral didn't I? What kind of a son am I? Where's Will?" His heart rate started increasing causing the alarm on the monitor to go off. Immediately two doctors and two nurses burst into the room trying to calm him down.

Voight just walked out without saying another word.

After it felt like hours the older Halstead decided to wake up. Those four days were a disaster for his life. He yawned, stretched his body and checked his phone dropping it on the bed as soon as he noticed the number of phone calls from the hospital. "Shit, Jay." Without a second thought, Will ran to the bathroom, washed and left the house wearing a pair of jeans and a black T-Shirt.

"Stupid traffic." He groaned from inside the car.

The only thing he could was to wait. Wait for a miracle so the cars would start soon.

"Jay, Jay." He almost broke the door getting in the room. He faced his brother sleeping. His oxygen mask wasn't on his face anymore, which was a good sign for his condition.

"He had a panic attack earlier." A voice was echoed in his ears.

Will threw a small punch on the chair located next to the bed and sat on it covering his face with his palms. "I should have been here, I… I… overslept."

Connor smiled placing a hand on his friend's shoulder. "It's okay, we were here for him."

"No, no… First I almost kill him and now I leave him alone."

He started sobbing quietly.

"I have news on the CT." That sentence caught Will's attention. "The day Jay was admitted here, we had another patient named James Hudson. He was here complaining about stomach pains after a fall he had on the construction he was working on." He stopped and took a deep breath. "The man recovered within two hours although his CT showed internal bleeding. Just as we're about to get him into surgery, his second test came normal."

"Where are you going with this?" Will wiped the tears from his eyes.

"We compared the two CTs, the man's and your brother's. Someone had switched them."

The young doctor goggled his eyes. He stood up facing Connor with his mouth open, his left hand covering it. "So, it wasn't my mistake."

The other man shook his head.

"Thank you, thank you." He hugged Connor tightly when they heard a groan coming from the bed.

Both of them turned their head to the source of the sound, taking a peek at their patient. He had his eyes opened, trying to sit up without success of course. Will ran to him, helping him until he was comfortable enough. He hadn't talked to his brother since he woke up so he looked forward to the moment he would get to see his bright green eyes again.

"Hey bro, how are you feeling?" He inquired receiving a glare from the youngest Halstead. "I get it… I heard you were a little intense earlier, what happened?"

Jay did not answer. He looked at Connor still standing in the middle of the room, smiling. The man got the message and took quick steps to the exit until he was disappeared from their view.

"We are alone now. You can talk."

He took a deep breath. "I missed right? Dad's funeral…"

"Jay, don't… Don't think about dad right now, our priority is you."

"You didn't answer."

Will nodded. "It was two days ago."

"He was right, I guess. I am not a good son, I was never a good son and I will never be."

"Hey, don't say that. You were here unconscious, you couldn't do anything about it, don't blame yourself." He caressed his brother's hair.

"Who is to blame then? I went after Daniel, I took a bullet and I disobeyed Voight's orders. Me. Only me."

Will sighed. He didn't expect that attitude from Jay.

"Look it doesn't matter alright? Forget everything. Forget dad, forget Voight, forget Intelligence for a while. It's just you and me now in this hospital. Your first priority is to recover and I will help you do it. I'll be here day and night for as long as it takes, till I collapse on the ground." He tried to keep his feelings inside although Jay knew exactly how his older brother felt.

Jay finally let his body relax and closed his eyes for a moment. When he opened them again, his brother was still there, sitting next to him, reading the news on his tablet. He looked out of the glass to the ICU hallway and noticed Adam and Kevin standing there watching. "Tell them to come in." The two policemen inserted the room not looking at their friend especially Ruzek. They sat on the small grey couch placed in the room after Will's demanding so he could sleep on it. "Come on guys, I don't look that bad." The injured man giggled but none of them talked. "So, how's work?"

"Good… The same." Kevin replied.

They both seemed like they were hiding something. Annoyed as he was, he coughed a little just to get their attention. Although his pain was unbearable and wanted to sink himself into darkness, he knew he needed to stay awake and find out what was going on.

"Are there any new cases?"

None of them answered. Will didn't either. He was aware that they were looking for the person who switched the two tests but every single search for him had come to a dead end.

"Maybe you need to get some sleep." He insisted pulling his brother's blanket up.

"No, until you tell me what's wrong."

"Nothing to be worried about bro."

"Alright." He let himself sleep this time. He was too tired to argue right now. He wouldn't give up, he would figure out the issue of Intelligence later, not like he could walk and solve it.

Will sighed leaving the tablet to the small night table that was located next to his brother bed. After he made sure that Jay was asleep, he motioned to the two detectives to follow him to a personal waiting room, a small room with a black leather couch and a tiny table inside. He closed the door and stood in front of them, meeting their gaze. "I told you to act normally." He kicked the floor with his shoe. "If he finds out that we are after a criminal who almost cost his life, he will do everything to find him first. Even if that means, discharging himself in this shape.

"Sorry." Ruzek's eyes couldn't meet the doctor's. Every time he looked at him or his brother, his mind was blasted with memories of that evening. The moment he and Hailey noticed their colleague on the ground, bleeding. He thought he was dead but then he was relieved that Jay was healthy. Or he thought so. He looked back on the time he received that phone call from Antonio saying that Jay was transferred to Med after some complications. And when he saw him in a comatose state on the hospital bed. Everything was too much for him.

"Just keep him calm. He still blames himself for our father's death, for not telling him goodbye."

Both of them nodded and exited the room only to find themselves standing in front of their boss and team.

"Any news?" Voight asked.

"He is stable, recovering, woke up a while ago and we had a talk."

"Good. We did a research for the new staff that has been hired the past weeks but we found nothing. Either the offender is too smart to hide in here or the CTs were switched by accident. So far the second option is more reasonable."

Stepping one step closer to Hank, he spoke. "No, it was no accident. Someone did this on purpose."

"Will, I know you love him but let's be realistic."

"No…"

Suddenly an alarm was sounded from a specific room attracting all the people gathered in the hallway. A couple of doctors and nurses started running towards the ICU in less than 30 seconds being followed by all detectives on the scene. The flat line on Jay's monitor changed everything, their hopes, their dreams, their plans. Others such as Hailey and Burgess cried instantly. Others stood still watching Rhodes and Choi above their friend trying to resuscitate him with every way possible. But only one of them didn't react. Will. His eyes were unfocused, his knees buckled for a minute before he fell flat-faced on the floor.
"We need a doctor here." Antonio's screamed at the top of his lungs. The door of the room opened revealing an anxious Connor kneeling down to Will.

"Hey, buddy, not you too." He murmured as he checked his pulse. "He is alive, we have him back, come on, let's get you to a room. I need a gurney over here, NOW." He shouted to one of the nurses standing in front of him. "You will be alright, both of you will be fine."

Something soft was underneath his body, a mattress probably. Without a second thought, his eyes snapped open and faced the ceiling. He was laid on a bed. Why was he laid on a bed? He figured it out pretty quickly. "Jay!" He spoke sitting up quickly but falling back again being hit by a terrible wave of dizziness.

"Hey, you need to stay down for a while."

"Where's my brother?"

"He is alive and being treated. However, they reconnected the vent." Voight's words hunted him once again.

"I need to see him, now."

"Not for the time being Halstead, I am sorry." Another haunting voice.

"Rhodes, you know I…"

"I will have to deny it, I am sorry. It's for your own good. You will stay here and recover."

Will gave a punch to the bars of the bed.

"So, what's wrong with him, doc?" Hank pointed at the furious man.

"Ahhh, nothing to worry about. His emotional distress combined with the lack of sleep caused his brain to shut off for a few minutes. He will be back in a day or two."

A day or two? What was he talking about? Will needed to be next to Jay now.

"There is no way I am staying stuck in this bed."

"Don't make restrain you."

"What about my detective, doctor?"

His face immediately saddened.

"You said he was alive." Will interrupted.

"He is… I don't know for how long. Someone poisoned him, we found strong meds in his system, meds he shouldn't have taken."

"I knew it was not an accident. They are after him. What are we going to do now?"

"We could prevent another incident by limiting his visits. Only you, his team, April with Maggie, Choi and me. We almost lost him for real tonight, if something like this happens again, he won't pull through."

"We do this." Voight said in a demanding tone. "I'm not losing my son."

Hello, again guys! First of all, I want to thank you for reading my story and following it, I appreciate it! Here is the second chapter of "My Mistake". I hope you like it 3 Love you all!

~The Fourth Bionic~