TERRITORY DISPUTE

The product of a few too many views of "Who's That Girl?" Tony-Kate-Ziva music vids on YouTube. The team is shocked when they walk in one day to find Kate sitting at Ziva's desk as though nothing had ever happened. What has happened, who is the person they buried three years ago, and will Kate and Ziva ever learn to work together when they both feel entitled to the same place?

DISCLAIMER: I don't own the lyrics or the song or the characters of NCIS.

LYRICS: Who's That Girl?, Hilary Duff

Prologue – Who's That Girl?

Who's that girl?
Where's she from?
No she can't be the one
That you want
That has stolen my world
It's not real, it's not right
It's my day, it's my night
By the way
Who's that girl living my life?
Living my life

Agent Caitlin Todd couldn't stop the grin from spreading over her face as she slipped into NCIS early that morning. It had been three years, one of the longest operations she had ever done, and she was finally back where she belonged. Maybe she would oil Tony's chair so that it slid right out from under him when he arrived. She had to do something to show them that she was back.

The Secret Service would have called ahead to the girl who had been playing her at NCIS, warned her not to come. So her desk would be nice and empty – probably nothing like what she had left it in, but she could deal with that. Oh, today was going to be her day…

She got up to the team's bullpen, looking around fondly at the abandoned desks. Then she slid into her chair – they had changed chairs, apparently, she'd need to get used to this one again – and opened the drawer to pull out the open cases file.

The files weren't there. Sighing, Kate closed the drawer again and began searching. Evidently the girl had changed everything around. She would have to put everything in order again.

Finally, she located them and pulled them out. Opening the file, she did a double-take at the name on the file: Officer Ziva David #N94063. An NCIS employee ID, not hers, and who the hell was Ziva? Was she in the wrong bullpen? Yeah, that was it, she was in the wrong bullpen.

Wait a second – her keys had opened the locked drawers. This had to be her desk. What the hell was going on?

"Excuse me?" came a woman's sharp voice from in front of her. "What are you doing?" The file was yanked from her hand immediately. "That would be classified information on a federal investigation."

"I'm sorry, this is my desk, lady," Kate replied, looking up. Her confronter was young, probably her age or a little younger, dark-haired, had a slightly Middle-Eastern look about her. She dangled the keys in front of her face. "My keys, my drawers, my desk."

"That is my desk," the young woman replied tersely. Almost as soon as she said that, Kate could hear Tony's voice crowing from the elevator.

"Yes! First one here today!"

"Not quite, Tony," both women called at once.

"I don't count you, Ziva, you're always here at 7," Tony said with a grin as he turned the corner and tossed a wrapped breakfast of some kind at her. Then his grin faded. "What's going on?"

"Who the hell is she?" Kate and Ziva both exclaimed in unison.