Tony was starting to get frustrated. Waiting for Steve and Natasha was boring so he'd tried to start looking into Gabriel alone; and had absolutely no luck.
Facebook, Twitter, MySpace, Bebo, Instagram, Tumblr, Flickr, Pinterest, even dating sites; he wasn't on there. Tony could find no record of him anywhere online. He didn't seem to have a mobile phone or credit card, no bank account, mobile phone or driving licence; nothing, he just didn't exist. Tony was just beginning to wonder whether Clint and Natasha would be so impossible to track down when Steve and Natasha walked back in, Nat throwing a rather heavy bag at him as she made her way to the couch.

Tony rifled through the bag looking for the file he was after.

"Hey, where's mine? That's favoritism Cap!" Tony complained as Steve came back to hand Natasha a glass of water and some aspirin.

"Alright Tony, what do you -"

"It's not here!"

"What isn't?" Clint asked, re-entering the room and rubbing his eyes tiredly.

"The file I wanted, you sure you got them all?"
Natasha looked at him and raised an eyebrow, not even bothering to answer the question. Too exhausted to come up with a sarcastic or witty remark.

"Whose file are you after?" Clint asked, throwing himself down on the couch next to Natasha and leaning his head on her shoulder.

"Mark Gabriel; I'm sure it's him!"

"Gabriel's been MIA since last November, he went missing while undercover in Columbia" Natasha answered.

"Yeah it was a right mess. Two agents died and Gabriel was reported missing, suspected dead." Clint added, eyes now closed as he snuggled closer to Natasha.

"That doesn't help, it could still be him. Where's his file?"

"He's been suspected dead for over six months; his file would have been archived and the physical copy destroyed. We can hack into SHIELDs server from here to the archive but if they're looking closely enough they'll know..."

"Do it"

"Clint, you're gonna have to move, I need to get the laptop..."
Clint was now asleep, leaning into Natasha with no plan of moving, so Bruce brought his tablet over and handed it to her. A few minutes later Tony was surer than ever that Gabriel had been the mole on the Latvia mission.
The problem now was; with him being absent from SHIELD for over six months, who'd been feeding Nazari information since?

"There's either another mole, or Gabriel still has access to SHIELDs information somehow..."