A/N: This is my first NCIS fanfic so please, be kind. This is also an NCIS/ Criminal Minds crossover, with the teams from both shows. I'm pretending like Twilight never happened, since I've never seen any episodes with Ziva as a character, and Kate's just awesome.

Disclaimer: The characters of NCIS belong to DPB and the characters of Criminal Minds belong to Mark Gordan, and coincidentally (?) both belong to CBS Paramount. I don't own them, please don't sue... I still have to pay for college!

Prologue

He drove cautiously, ever so carefully, down Constitution Avenue. The torrential rainfall beat a steady rhythm on his tiny sedan, matching the rhythm of the blinking construction lights that were so common in the American capital. Softly he swore to himself, cursing the rain that had been falling on the sleeping city for nearly an hour. Now he was going to have to wash his car again. It, like everything else in his life, was meticulously maintained. Before this latest downpour, the exterior was sparkling, the interior spotless, the engine purring like it had the day he bought it. That was just the way it was. It was the way he liked it, and everything had to be the way he liked it.

He took a right onto York Avenue, making sure to signal. Slowly he accelerated to the speed limit and eased up on the accelerator. This was one night he didn't want to be caught doing something illegal. He chuckled softly at the irony of that thought as he pulled up to a red light. In the distance the light of the Washington Monument shone through the sheets of rain. She would have loved to see it, he thought. He sighed as the light turned green and he gently moved his car through the intersection. It really was a shame. She was such a nice girl, so… satisfying. But, he surmised, all good things must come to an end. Even her.

An hour later he eased his car into the Scotts Run Nature Preserve parking lot. Killing the engine and turning off the headlights, he opened the door of the midnight blue sedan. The rain had stopped, but a chilly breeze had picked up from the north. He shivered and flipped up the collar of his jacket before moving around to the rear of the car. Slowly he opened the trunk, rainwater running down onto the rear window and off the body of the car. "Hello, dear," he whispered.

Her eyes stared up at him like two brown ponds. He ran a hand down her pale, cold face. "Don't worry," he whispered. He leaned forward and kissed her stiffening forehead, chestnut hair matted with congealing blood. "Time to join our friends."

He grasped the starched, bloody threads of her uniform and pulled her out of the trunk. Careful not to drop her, he carried her down the familiar trail until he found the turnoff he was looking for.

Gently he set her body down in a small cove next to the knotted trunk of the oak. He brushed her cheek with the back of his hand and whispered, "I brought you another friend, my darlings. Please make her feel welcome." One by one, he lovingly caressed their cheeks, and one by one, he kissed them goodnight.

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"Dan! Slow down, honey, I have to catch my breath." The young jogger slumped against one of the oak trees a few feet off the trail. She bent over and rested her hands on her knees, gasping for breath.

A few yards up the trail, the jogger named Dan turned around and jogged back. "Hands over your head, Chelsea," he instructed, wiping sweat from his tanned face. "You don't want to get a cramp."

Chelsea groaned and slowly complied, concentrating on slowing her breathing. Her blond hair was matted with sweat, and her arms glistened in the autumn sun.

"Hey, follow me." Dan glanced around and stepped off the trail, trekking deeper into the woods.

"Dan!" Chelsea completely forgot about catching her breath and dashed after him. "What the hell do you think you're doing?"

"Exploring." Dan pushed aside a tree branch and a torrent of red and orange leaves rained down on him. "We've never been up this far."

Chelsea caught up to him and grabbed his arm. "And what if we get lost?"

"Come on, Chels, where's your sense of adventure?" he teased.

She glared at him.

"Who cares if we get lost? We're all alone out her," he said as he wrapped his arms around her waist. His hands ran up and down her nearly-bare back. "It could be kind of romantic." He leaned forward and kissed her neck.

"It could also be a little cold out here," she said sternly, but he covered her mouth with his, silencing all protests.

Suddenly he stopped. "Hey, what's that?" he said, breaking from their embrace and walking over to a small cove by one of the larger oak trees.

"What's what?" Chelsea asked as she followed him. Her eyes fell on a dark blue and red strip of cloth peeking out from the bed of leaves.

Dan bent down to examine it. Slowly he brushed the leaves off. A blue sleeve appeared, red chevrons standing out against the dark cloth. The sleeve still contained a cold, lifeless arm. "Oh my God," he whispered softly.