Title: When Two Worlds Collide
Rating: PG-13
Category: Case fic
Genre: Gen
Pairing: None currently
Summary: Gibbs is due to retire but first he has to get through one last case.
Disclaimer: The characters herein belong to DPB, CBS, Paramount, et al. No copyright infringement is intended.

Ziva turned glaring in the direction of the voice, McGee stared in surprise and Gibbs turned to Director Vance, "You called DiNozzo in?!"

Ziva turned her attention back to Gibbs, "I called Tony from my car… He knows the details of the case, I decided the best chance on keeping you alive is having the three of us back together and working with you again."

McGee looked at her his mind suddenly clearing, "Ari…" She nodded in response and he continued, "They finally discovered it wasn't Gibbs that pulled the trigger?"

She shook her head, "No they still believe it was him, that is the issue. Men who are still loyal to my father with revenge on his part; they have sent an officer to America to kill Gibbs…"

"Shai Levi?"

Ziva shook her head once more, "No Shai was here on my orders, he was to find the rogue agent and neutralise him, to protect Gibbs…"

Jen scoffed from her desk, "Great job he did…"

Tony and Tim both winced as Ziva turned to her, her eyes were cold as she looked to the agent, "Special Agent Whyte do not for a moment think that you could have done better…" She took several steps towards the desk and watched as the woman shrank back away from her, "This simply demonstrates the skill level of the officer in question, he is more competent that I had anticipated, but this is what we are trained to do..." She leant over the desk clearly intimidating the younger officer, "Right now I could kill you in at least twenty different ways so efficiently you would not even be able to begin to fight back before you breathed your last…"

She moved away from the desk, "I want you to run the details of everyone arriving into Washington on a plane from the Middle East in the past week; pay particular attention to anyone who entered on a diplomatic passport." She turned to the male agent who had remained silent up until that point, "I want you to get me video from airport security and start matching faces to names…"

Both of the agents looked towards Gibbs and he looked back, "Well? What are you waiting for?"

Both agents sprang into action, making calls and accessing computer records. Tony crossed the room to join his former team, "Looking good Zeev…"

She laughed and grabbed her bag, "And you are still not getting any DiNozzo…"

She disappeared down the stairs heading for the locker rooms to change. On her return to the bullpen the suit and stilettos were gone and in there place was the agent everyone recognised from her time on the team, Ziva stood in her boots, cargo pants, vest top and jacket; her hair pulled free from its intricate top now flowed freely around her face as she pulled out a chair and sat down in the midst of her familiar old team.

Tony looked over at her, the humour now gone from his eyes, "How bad is this Ziva?"

She paused, "Very… though the Prime Minister is pleased with the direction Mossad is moving in there are still those within its ranks that remain loyal to the old ways; to my father. They still believe that the most important thing is the reputation and honour of the director and his family. I feel they will stop at nothing to kill Gibbs and restore my father's honour…"

Tony nodded in understanding. "It seems to be there is one easy way out of this mess…"

Ziva looked up him, for the first time her voice was not filled with the confidence and authority but was instead quiet. "Yes I will have to admit the truth; that the report was faked."

"Absolutely not!" the pair of them looked towards the voice, "Ziva I knew what I was doing when I wrote and signed that report. I wrote it to protect you from your father and his friends and I stand by my actions. I will not allow you to attempt to save me by putting yourself in danger…" she opened her mouth to speak but he growled at her, "Consider that an order David…"

She smiled slightly and nodded, "Very well Gibbs, in that case we must identify the rouge agent and hope we find him before he finds us…"

Gibbs nodded and answered his phone as it rang, "Be right down Abs…" He turned to the others, "Abby's got something…"

All five agents stood and he pointed to Moretti and Jen, "Not you two, you keep running those names, see if you can find anything else…"

Gibbs joined the other three and together they took the short trip down to the lab, "What is it then Abs?"

She continued watching her computer screen as she began to talk, "Moretti sent me the airport security tapes to run facial recognition on? Do you know how many flights come in from the Middle East in a week Gibbs, how many people?! It's a lot but that's not important, I ran the tapes against the Mossad agent database. How did you swing that Gibbs? It usually takes days to get any access and even then it's limited…"

"I authorised the search Abby…"

She swung round at the sound of the second voice, "Ziva! Ziva you came back!" she ran over to her and pulled her into a bear hug, "I missed you! You never call, you hardly ever write…"

She pulled away and looked disapprovingly at her; Ziva smiled, "I will make more of an effort in future Abby, I promise…"

Abby nodded seemingly satisfied and then spotted the man standing at the end of the line, "Tony!

She rushed to him pulling him into another of her hugs, "Oh we're all back together just like the old days!"

Gibbs rolled his eyes but could help but smile as he gently reminded her of the reason they were all standing in her lab, "Oh yeah I got a match! An Officer Nahir David…"

All eyes turned to Ziva and she answered their unasked questions, "He is a cousin, his father is my father's younger brother. Growing up we both looked upon my father with a great deal of respect an admiration. As I grew older I saw him for the man he truly was; Nahir never did, he idolised him until the moment he died…"

DiNozzo looked at the face on the plasma screen, "Is he any good?"

She nodded, "My father trained us together, Nahir is one of the best and blind to my father's faults, I doubt he will be reasoned with…"

Tony picked up the evidence report from the desk, "So we'll have to find him before he finds Gibbs…"

"Indeed." She turned to Gibbs, "From now on you go nowhere alone." She hushed him as he opened his mouth to complain, "I do not want to hear it, I will admit you are more able than most to deal with the threat, your training has made you more aware of your surroundings than most but this is a highly trained assassin."

The rest of the day passed in a blur of activity, the team spent hours reviewing more security tapes and attempting to track Nahir's movements since his arrival in the country. As the sun began to set Gibbs ordered the team home, informing them all to be vigilant as it was possible that they could be at risk themselves.