I would like to thank surferdude for beta-reading this. Read, enjoy and review. It's a crossover between NCIS and NCIS;LA. It focuses on Callen and Ziva.

Unknown Past

Chapter 1

Nervous

Callen kept pacing which, in itself, was a rare occasion. Sam and Kensi were surprised by his behavior during this past week. He wasn't himself. He was on edge. He was nervous.

'Ok, what's going on?' Sam asked. 'I've never seen you like this.'

'What do you mean? I'm fine. Just having trouble sleeping. Too much coffee, I suppose.' Callen walked away trying to avoid the conversation.

Sam and Kensi looked at each other. Sam shrugged his shoulders. 'He'll open up…after I'm done with him.'

Kensi chuckled. 'Go get him, Sam.'

The rest of the week was the same. The team coming into MTAC while Hetty was talking to Vance. 'So Agent David is definitely coming to LA to assist us in the investigation?' Hetty asked.

'Yes, her background will be of great value to the investigation. She knows her way around an orthodox Jewish community, so we won't be insulting anyone without even knowing it,' Vance assured the woman.

'When will she be arriving?'

'She's on route as we speak, should be there shortly. If someone can pick her up it would much appreciated. We have arranged a hotel for her, she'll know which one.'

Hetty nodded. 'Will do, Leon.'

Vance gave his usual brisk head shake, indicating the conversation was over and the communication was severed.

'Sam, Callen go pick up Agent David from the airport,' Hetty instructed the men who had just walked into the room.

'Why not send Kensi and Deeks, or just Kensi?' asked Callen nervously.

'What is going on with you, Mister Callen?' Hetty asked, taken aback by Callen's sudden outburst. Callen shrugged his shoulders and walked out.

'Agent Hanna, watch him for me, will you? Something is sure as hell is bothering him.'

'I will, Hetty,' Sam promised the diminutive woman.

Sam and Callen drove to the airport in silence. Sam kept looking at Callen during the ride.

'G.?' Sam finally asked, the silence from his partner killing him.

'It's none of your business, Sam. None of your business,' Callen said before Sam could get another word out.

'It is my business, you're my partner. What's going on? You've been on edge ever since we heard that Agent David might be…..' Sam stopped talking. 'Agent David, it has something to do with Agent David.'

'Leave it, Sam. Just leave it,' G. said.

Callen parked the car and was out of the car even before Sam. Sam had to jog in order to catch up to Callen.

'Why are so damn nervous, G.?' Sam grabbed Callen by the arm. 'What is it about Agent David that makes you so on edge?'

Callen sat down at a coffee stand and bought two coffees for him and Sam. He took a deep breath. 'She used to be my wife,' he told Sam.

Sam sure as hell didn't see that one coming. He sat down next to his friend and for a few minutes, they sat there in silence.

'She was the one, Sam. She was the one.'

'What happened?' Sam finally asked.

'We were young, we were in love, we got married, she got pregnant, and I ran as fast as I could in the other direction,' G. told him.

'You left her,' Sam said, not posing it as a question.

Callen nodded. He was so ashamed of his actions even after so many years. 'I wasn't exactly the person I am now. I would never in a million years would do such a thing now, but back then, I wasn't ready. I was pretty messed up back then and I didn't know how to tell her or what to do, so I took the cowards way out. I ran.'

'Have you talked to her since?' Sam wanted to know.

Callen shook his head. 'No, never. She wrote two letters I opened the first one, telling me the baby was born and I didn't even open the second one. I was convinced they were better off without me,' Callen said.

Sam stood up. 'Let's go. Her plane landed.'

Callen and Sam stood side by side watching the crowd waiting for Agent David. Callen spotted her the moment she came out into the waiting area. 'There she is,' he pointed her out to Sam.

Ziva walked towards Sam and Callen. She introduced herself to Sam and shook his hand. She didn't offer her hand to Callen.

'Please call me Ziva. After all, we are colleagues,' she told him.

Sam noticed she didn't even look at Callen. The car ride to the hotel she was going to be staying at was done in utter silence.

'Hetty's expecting you tomorrow morning at 07.00,' Callen said. 'Do you want me to come and pick you up?'

'I do not need anything from you.' She got out and walked off.

'That went well,' Callen said sarcastically.

'Can you blame her, G ?'

TBC…

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