Here is that multi-chapter story I've been talking about. I'll be updating weekly right now. So keep a good lookout!

Warnings: Coulson lives in my series. That's your only warning.

Disclaimer: I don't own either NCIS: LA or The Avengers. But I do own Nadia.

A/N: If you want to picture Nadia, think of Katie McGrath from Merlin.

Summary: It is the their first mission as partners. But what Callen and Nadia do not know is that everything is not what it seems. It is just a small, quiet town, right? Maybe they just need to stop underestimating these sorts of things

Late October 2012

"Come on, old man," goaded Nadia Vadim as she circled her partner on the sparring mat.

G. Callen shook his head in amusement at his dark-haired partner. Ever since he joined S.H.I.E.L.D., he had been working hard to get into the new pace that his new employers had – which meant learning to get along with his new partner. He had not made it easy for her, considering that he at first did not trust her because of who she was related to; but when she confronted him a month ago, they had been getting along quite well. She had definitely helped ease the transition.

He had also made a couple of friends thanks to her – mainly Natasha Romanoff, Clint Barton, and Phil Coulson. The agency's two top operatives and Fury's right hand man welcomed him in easily and made sure that everything was alright for him. He hardly saw them half the time since Tasha and Clint were members of the Avengers while Coulson was still recovering; but when they were around and the handler was up to it, the five of them went out for drinks. It was fun…even though they had to drag Callen out. However, he did admit that those times were fun. "Old man? Wow, your vocabulary surprises me," he mocked as he took a punch at her.

Dodging, she laughed and said, "I can't help it that you move so slow." She then took the opportunity to drop kick him; but he managed to evade that.

Before they could continue, a voice said, "You're both wanted in the briefing room." The duo turned to see a young junior agent staring at them in wonder. "Director Fury and Agent Coulson ask that you come immediately," he added as he turned and left.

Callen and Nadia looked at each other before shrugging. They grabbed their gear and stopped by their respective rooms before heading to the briefing room. Just like the young agent said, Fury and Coulson were waiting for them. "About time you two decide to show up," Fury said as the duo walked in.

"Didn't know we were on a time schedule," Callen retorted, rolling his eyes.

Nadia chuckled. "We're always on a time schedule. A few of us just don't give a damn about it," she said as she took a seat at the table.

Coulson rolled his eyes before sliding over files to each of them. "These contain your assignment," he started.

"You think we're ready?" asked Callen. He had not been with them for that long, so he found it rather intriguing.

"Callen, you're more than ready. Besides, this should be fairly straightforward," replied Coulson.

"Nadia has been an operative for us for a while. Your skills require less training thanks to your past affiliations," said Fury. "You're an operative now whether you think you are or not. However, you both are going to be more investigators than assassins and spies." Callen stiffened a bit – he kept forgetting that this agency employed those types of people – but relaxed when Nadia gently put her hand on his knee.

"Anyway, you're both going undercover in a small Vermont town called Moon Valley," started Coulson, who quickly took charge back. "For the past few months – few years actually – tourists have been disappearing while visiting. Normally we leave this to the local police; but a couple weeks back, we began to pick up a few strange radiation signals coming from the town."

"What kind of signals?" asked Nadia.

"We don't know," replied Fury. "But they have been intensifying."

"You think something is going to happen," said Callen, realizing what they were talking about.

Coulson nodded. "We think something is going to happen. We just don't have the proof."

"So you want us to go in and see what is going on."

"Yes. Your cover is that of a newlywed couple taking a road trip through New England," said Coulson as he handed them each a new folder.

Nadia smiled. "James and Cassandra Wright. Married two weeks ago after dating for three years. Both from New York," she read.

"Coulson is your temporary handler on this case," said Fury. "You answer to him and follow whatever he tells you both to do."

"You both can come up with more of your background history. Just let our analysts know. You both leave in twelve hours," said Coulson. "Dismissed."

The duo nodded, grabbed the folders, and left. "Why does this sound like a wild goose chase?" asked Callen. "Are these missions normally like this?"

"For the most part. The stuff Tasha and Clint do is more straightforward considering each of their particular skill sets. SHIELD investigations tend to start with rumors before finding actual proof," responded Nadia. Callen nodded as they continued on in silence before reaching Nadia's room. As they entered, she said, "Okay, Mr. Wright – gosh, that sounds so cheesy. Anyway, you want to work on history."

"Does that matter? Usually, Eric and Nell just set up false information that most people would look for like high school, college, awards, those sorts of things."

"Our guys here do that to. So we don't worry about that. But we do want to keep our stories straight," she said. So they spent the next two hours fleshing out their "personal history". Callen was not use to something like this; but he had to admit that it was fun.

Before they could go any further, a knock was heard on the door. "What?!" yelled Nadia. Callen laughed.

"Shove it, Nadia!" came the familiar voice of Clint Barton. "You both decent?"

"Get your mind out of the gutter, birdboy," she retorted. "Come in!"

The door opened to reveal a man with light brown hair and blue eyes. He was dressed in civilian clothes. Spotting the folders, Clint asked, "You guys got a case?"

"Yeah, in Vermont," said Nadia.

"Sounds fun. Lots of forest green." Nadia rolled her eyes at that remark. Clint then looked towards Callen and asked, "You ready for this?"

Said man shrugged. "As ever. Though, from what I figuring, the cases that SHIELD deals with are going to be…"

"Interesting?"

"Abnormal."

Nadia laughed. "That's for sure. SHIELD deals with abnormal quite well no matter how normal we try to make them," she said.

Clint shook his head. "Tasha and I wanted to know if you guys want to go get something to eat. She's even dragging her boyfriend along," he said.

"She's managed to get Bruce away from Stark?" asked Nadia. "I don't want to know how she did that."

Clint smiled and said, "Very wise decision."

"Bruce? I didn't know Tasha was dating," said Callen. Though, come to think of it, he should have suspected it.

"Dr. Bruce Banner, otherwise known as the Hulk," said Nadia. "Bruce is a nice guy and Tasha is good for him and vice versa. Though we should be thankful that he doesn't have Stark's tendencies."

"That's the truth," agreed Clint. "But somehow he and Tony get along. Best friends even." There was silence for a moment before Clint added, "If you guys are coming, we better get going. Tash and Bruce are going to meet us at the restaurant." With that, he left.

Turning to her partner, Nadia said, "You hungry, darling?"

Seeing the mischief in her eyes, Callen replied, "Whenever you are, love." They hid the files, grabbed their coats, and left to catch up with the assassin. They could not hang out long; but they can enjoy it while they can.

Dinner was wonderful; and Callen found Bruce Banner to be quite interesting. He had heard of him, of course. With the military searching for the scientist a few years back, everyone got involved. But Jenny Shepard kept NCIS out of it. No one knew why; but many thought that it was because she considered it an Army problem, not a Navy or Marine one.

Now, sitting across from the scientist, Callen could not figure out why he was so dangerous. Of course he knew that the big green guy the doctor can turn into was dangerous; but Banner seemed to have a good control over him. And he can see what Tasha saw in him. One would have thought she would go for a guy like Callen or Clint; but apparently she went for Banner because she understood him – she saw where he was coming from. And that seemed to make the relationship work.

"So when are you guys going to introduce him to the others?" asked Bruce as they finished dessert. Callen cringed. The subject of the Avengers had come up once or twice, but Nadia seemed reluctant to introduce him. Not that he cared – he rather not get involved with them. Clint and Tasha were enough.

"We haven't thought that far yet," said Nadia. "At first I was going to involve them but I put that thought away." She looked at her partner. "I guess that leaves it up to you."

"I'll think about it," Callen automatically said.

Bruce nodded. "The others are interesting," he said. Clint, Tasha, and Nadia snorted. "Okay, 'interesting' wasn't a good description."

"That's an understatement," said Clint.

"Speak for yourself," said Nadia. The archer tossed her a glare while Tasha chuckled.

"Let's see. Tony's an ass. Thor's hardly ever there, so no way to really describe him. And Steve…well, Cap's probably the nicest guy you'll meet, considering how out of date he is," said Clint. "Tony's working on that."

"Oh help us all," muttered Nadia. She turned to Bruce. "Get Rogers away from Stark. He might actually learn something then."

Bruce smiled. "I'll try," he said. "To tell the truth, he's been asking Natasha and I questions more than going to Tony." Nadia nodded her head in approval.

"He's actually been doing well regardless," said Natasha. "He goes at his own pace as to not get overwhelmed." The redhead looked at Bruce. "Though Tony is an ass." The group laughed.

Clint looked at his watch and said, "Damn, I guess we better leave. Callen and Nadia have a mission to start in a few hours."

"We better back. Ready, Mrs. Wright?" he asked in a sweet fake voice.

Nadia grinned mischievously and replied, "If you are, Mr. Wright."

"Seriously, those are your cover names?" asked a disbelieving Clint. The duo shrugged as they waved goodbye to the others and headed back to headquarters in order to pack and get some sleep. In five hours, they were going to become actors.