A/N: Wow I'm loving the response this has gotten already! Everything will be explained in time, though I'm sure some of you have a few ideas as to how Molly has such knowledge.

New Scotland Yard

Lestrade glanced at the woman leaning against the wall in his office as he looked over the papers he'd been handed once again. She had come in earlier with a request for assistance in the recovery of a stolen item. After looking over the information he still wasn't quite sure who or what he was dealing with, but he knew he was considerably out of his depth. He'd sent Sherlock a text nearly an hour ago, telling him to come to the station.

Sif sighed impatiently as they waited for this Sherlock person to show up. Had she known how little help the police were going to provide she'd have accompanied Loki to the hospital. She only hoped he was having better luck gaining access to the labs there.

The door slammed open, "If this is about my behavior at the last crime scene, I can assure you that Anderson deserved more than what I had said." A tall man in a coat with wildly curly hair had entered the office, his eyes never leaving the mobile phone in his hands.

"No it's not," Lestrade sighed as he handed the file over to the man.

He flipped through the pages quickly, skimming the details, before Sif caught his eye.

"Sherlock, this is..." Lestrade began.

His eyes flicked across her in a familiar manner, it was the same look Loki would give her when trying to determine whether or not she was lying.

"You're a soldier, but not in any of the military branches. You have been for most of your adult life, which is considerably more than your youthful appearance would suggest. You fight best with a sword," he gestured towards her. "Your hand keeps drifting to your hip as if to grasp the hilt of your sword. Given what little is known of this missing item and your presence here I take it you require cooperation from and access to the police force. What exactly does this item do, Lady Sif?"

Lestrade's mouth dropped open, "You know each other?"

Sherlock waved his hand dismissively, "Of each other."

Sif smirked, "Your reputation precedes you Sherlock Holmes."

Sherlock rolled his eyes and scoffed, "I take it your associate is elsewhere, attempting to establish a cover story?"

Sif huffed and crossed her arms, not liking the tone he was using. "My companion is at St. Bart's, he can explain the more technical aspects of the item we seek."

Sherlock frowned at her mention of St. Bart's, turning quickly he left the office, file in hand.

When Sif didn't follow he peered his head around the door, "Well are you coming or not?" he asked impatiently.

Sif rolled her eyes and nodded at Lestrade as she followed Sherlock out.

St. Bart's Pathology Lab

The doors to the lab swung open as Sherlock waltzed in. He turned and noticed Molly laughing with a pale young man at one of the lab benches. They were both seated close together and seemed to be having an enjoyable conversation, he frowned as he continued staring at the two of them.

Molly felt his gaze upon them, she moved to walk over and ask what he needed when a hand on her knee stopped her. She looked puzzlingly at Loki, who gave a slight shake of his head. She pursed her lips in confusion and remained in her seat, taking a sip of her coffee.

The exchange did not go unnoticed by Sherlock who glared at the man, who merely raised an eyebrow in response.

"Really Molly, I would think your previous endeavors have taught you the dangers of office romances," Sherlock said.

Molly rolled her eyes, having put up with his behavior for months after he faked his death, she'd learned to ignore most of his comments.

Loki smirked, "So the great consulting detective has graced us with his presence," he said mockingly.

Before Molly could make introductions Sherlock interrupted her.

"You would be the companion Lady Sif mentioned. Tell me I am curious as to why the younger, disgraced son of Odin would be sent on a simple retrieval mission. Part of your penance? How does it feel to know no matter what you do it will never be enough?" Sherlock knew he was treading on dangerous ground but watching him with Molly had sparked something inside him.

Loki growled dangerously, "You know not what you speak of." He stood and the air crackled with magic as his temper flared.

Molly attempted to place a calming hand on his arm just as Sif came running in.

"Loki, don't" she commanded. He ignored her, his focus on the man in front of him.

She walked forward and pulled a blade from the hidden sheath at the small of her back "Loki," she said again warningly.

His gaze flicked to the blade in her hand. "Going to threaten me again milady?" he smiled mockingly at her.

"Loki stop...Now!" she spat, preparing to knock some sense into him if need be.

He sighed and lowered his hands as the magic dissipated.

Sif sheathed her blade and glared at him. It was then that she noticed the young woman next to him, who was glaring at Sherlock across the room.

Sherlock was wearing a smug look as he observed their interaction. However his face soon fell as he looked towards Molly and was met with a thunderous glare.