The new piece of the puzzle

F. B. I

C-"Thank you for the opportunity but I work better alone, and I have learnt it is better to not get to close to anyone. But if you ever need anything here I my number, the team knows my house address and you know it to. You know everything about me, or so you think. My file doesn't have everything."
I rise from the chair and head towards the bull pen. Before I leave I place a small black box on Kensi's desk. Inside was a silver US Special Forces ring that my father had left me before he was deployed. It had a green stone centre in the middle of the stone there was a sword with two arrows crossed behind. When I got home there was an unknown car parked out the front of my house, so I grabbed my gun out of the holster and when I walked in I saw a tall figure standing in my kitchen. When the figure became clearer to me I realised that it was Callen. "Do you want me to shoot you or do you just have a death wish?"
G- "Well that would be killing a federal agent and that is illegal. Are you thinking about joining NCIS?"
C-"No, I work better alone. Not having to rely on anyone and no chance of getting to close to anyone that makes my guard fall. I have other business that needs to be taken care of and plus no one will take a 12 year old seriously."
G- "They might not think so at first but after they see what skills you possess they will take you way more seriously. We need someone like you on the team because no one will ever suspect you. Be ready, we are most likely going to need your skills soon."
He left my house and left an A4 size envelope along with a small dark blue box, almost identical to the one I left on Kensi's desk. I opened the box and it was almost exactly the same as the one left on Kensi's desk except this one is gold. I opened up the folder, it was a form to join NCIS, and all that was needed was my signature and the date. I grabbed the pen out of my singed, but I could not bring myself to sign the date. I went on my laptop and I had received an email from the FBI, they found out what I had done and now they want to have me pay for what I have done. The form was sitting next to me and I knew that if I didn't sign it than I will be going to jail and my life will be over. So with my last choice I signed the form and I feel asleep on that note. I was awoken by a loud knocking on my front door, from what I could see from out of the peep hole it was the FBI. I knew that I had a few seconds before my front door was knocked down, so I ran to my bedroom grabbed my bag and put the ring, papers, my laptop and my phone in there. I went down to my undergrown bunker, it had and steel door that lead to the backyard or my next door neighbour. They were a family that I knew from when I was a child and they were looking out for me ever since my father, mother and siblings were killed. When I climbed up the 10 foot ladder it connected to a ladder that was used to climb up to the kid's treehouse. After I got up to the tree house platform I grabbed one of the kids' bikes, rode to the convenience store, brought a burn phone and then took out the battery to my phone so I can't be traced rode to the closest diner. I used the burn phone to call Kensi and she was at the diner within a matter of minutes. She and Deeks walked into the diner, I handed her the envelope but I saw one of the FBI agents walk in. He immediately saw me, went towards his gun and began coming closer and closer. I panicked, sprinted towards the back, exited through the back door and ran onto the streets. I was only a few minutes away from headquarters so I decided to run there but I could feel that I was being tailed, so I ducked into an ally-way and called Kensi. She drove by and I jumped into her car, we were taken directly to headquarters that already had FBI agents sweeping through the bull pen and asking everyone questions about what I have recently done at this agency. She handed me back the envelope, I headed over and handed it to Hetty. The FBI agent came over and put me in handcuffs. I was taken down to the burro and I was taken to the interrogation room. The agent that came in was one I had seen multiple, he was at my house, at the diner and was the one tailing me. His badge said that he was FBI agent William Shucks.