AN: Thanks to all the feedback I got for the first chapter. I had intended it to be a one-shot but since everyone seemed eager for a follow up, I decided to comply. Again any ideas or prompts you have feel free to PM me and once again, a massive Thank You to Lara Smith.

Arthur struggled against his bonds as blood trailed down from the cut on his forehead. The spies had been tied up and locked in a small darkened room. Arthur slowly loosened one of the knots but it seemed three more sprung up to take its place. The rest of his team weren't faring much better. Merlin was swearing in various languages under his breath but was relatively unharmed; Lance was slightly disoriented with a large bruise developing on his head and Gwaine was sporting a black eye and blooded nose. As the four men struggled to free themselves, Gwaine spat a bit of blood out of his mouth and turned to Arthur.

"Take some advice Dragon; next time you find a girl make sure she isn't a traitor!" Gwaine advised. Arthur ignored the remark; anger and regret was already pulsing through his veins at being so stupid. How could he have trusted her? He should have realised it was all a set-up and now all four of them were going to pay the price.

The four of them entered the warehouse with ease; the Agency was expecting a shipment of weapons and they had been assigned to intercept their arrival. Before they left Uther had warned them that their mission would be the make or break of the Agency; if they succeeded, the Agency was finished. The entire warehouse was completely deserted and the agents quickly realised they had fallen into a trap. As they drew their guns; they were quickly surrounded on all sides; outnumbered by at least thirty masked men; all of whom were armed with machine guns. As they contemplated their next move, Cenred stepped out of the shadows along with Morgana and Morgause.

"Well, well, well this is a surprise. I spring a rat trap and capture a Dragon instead. And look, Agents Lake, Ryder and Emrys are here too. Or maybe I should call you by your given names; skip the formalities. Arthur, Lance, Gwaine and Merlin." Cenred said smugly.

The four spies looked at one another. Nobody outside of Excalibur knew their real names. When they joined Excalibur; their histories were erased; the men they were before no longer existed. So how did Cenred know their identities? Somebody had betrayed them, but whom? As if to answer their unasked questions, Morgause smirked triumphantly at them.

"Don't look so surprised, we know everything about you; all of you." Morgause explained as Morgana pulled forward the armed agent next to her. Arthur felt his heart shatter into a million pieces as Morgana pulled off the stranger's hood and Gwen stared at them impassively; there wasn't a fleck of guilt or remorse anywhere on her face.

"What say you gentlemen, isn't she the most talented little actress that you've ever seen?" Cenred taunted.

Morgana gleefully clapped Gwen on the shoulder. "Didn't know you had it in you Gwen."

"We trusted you," Arthur whispered. "I trusted you!"

Gwen didn't say a word and instead she stepped back and pulled her balaclava back on while Cenred allowed his men to attack the spies until they blacked out.

Gwaine was the first to free himself from his bonds and he felt around but all their weapons had been taken from them. As the other spies were freed; Merlin quickly deduced that Lance was suffering from a concussion and Gwaine slung his teammate's arm over his shoulders as they looked around. The place was deserted but that only meant danger wasn't too far away. For all they knew the place was rigged to explode at any second. Now that they were free, they needed a plan. Arthur attempted the door but it was obviously locked and instead he began slamming his shoulder against it in an attempt to bring it down. His fury at Gwen's treachery was overshadowing all other feelings in his body until Merlin pulled him back from the door.

"It's not going to work. We need to find some other way out." Merlin said.

"Shut up Merlin!" Arthur snapped as he rubbed his shoulder.

"Look I know you're upset at what Gwen did; hell we all thought she was our friend but we need to work on a plan." Merlin insisted as he looked around for some source of inspiration. Arthur ran his hands through his hair in frustration as he thought about Gwen; the assassin who had failed to kill him and whom he brought to Excalibur. This was partially his fault; he had fallen for all her lies, her deceit. Had it all been a lie? The hugs, the kisses, the laughter, the late night conversations, the tears, the lovemaking… had any of what Gwen said or done with him in the past two months actually been genuine? Or had it all been part of some twisted Agency plan.

"How did a nice girl like you ever get involved in the Agency anyway?" Arthur asked one night as they lay in bed; the sheets tangled around them. Gwen looked down briefly, composed herself and looked back at Arthur.

"I made mistakes, I'd gone off the rails, lashed out at everything and everyone and was the perfect target. All the anger and fury of a scared and lonely eighteen year old girl appealed to Helios; he was scouring for recruits; gang members, junkies, anyone who would be moulded into perfect little soldiers. He found me, told me about the Agency; it would help me become strong, to find a place in the world; help me control all this anger and hate I had because back then I hated everything. The world, humanity, myself. So I agreed. They trained me up and helped me realise what I could and couldn't do. I found a place where I belonged but I lost my soul." Gwen explained truthfully.

"What about your family?" Arthur asked.

"I grew up in care; my family died in a house fire when I was ten and I was the only survivor. After the fire I went from being a happy, carefree kid to being so confused and angry at the world. I didn't know why I'd been spared; there was nothing special or extraordinary about me and I was almost jealous that I wasn't the one who died. I cut myself off from everyone; social workers, other kids, counsellors until they stopped trying to help. That was why I let Helios bring me in; he seemed to want to help, to truly care. Shows how stupid I was." Gwen explained bitterly.

"First of all you are amazing; you're brave, compassionate and we all love you. You're already like a sister to the lads and I swear I will never let anyone harm you." Arthur promised as he kissed her.

"I'll never let anyone harm you." Gwen vowed as she rested her head on his chest, soothed to sleep by the steady thumping of his heart.

She'd never let anyone harm him; yeah right. Arthur was willing to bet that every last word that had come out of her mouth was covered in lies. She had told him, the night they met that her speciality was undercover work. It was all so clear now. Cenred sent her because he didn't want her to assassinate him; he needed someone on the inside to pass information about Excalibur and its agents back to the Agency and of course he would have known Morgana and Morgause were lying straight away if it had have been them. How he had been so blind, Arthur didn't know. Arthur stamped the floor in frustration and the others turned to him.

"Look mate, you're pissed off, hell we all are but we need to focus. Deal with the angst later." Gwaine snapped. Arthur looked around at Merlin who was kneeling in front of the lock and seemed to be fiddling with it. There was a gentle click and the door swung open.

"How did you do that?" Arthur asked and Merlin held up a bobby pin.

"Oldest trick in the book; I found it in my pocket." Merlin said as he twisted the bobby pin in his fingers before opening the door a fraction and peering out.

"All clear," Merlin whispered and the four of them crept out and through the warehouse. It seemed they were being held in one of the back rooms and they stopped as they reached the main area of the warehouse; the only way out was being blocked by their enemies; they were outnumbered and unarmed. The four of them crunched behind some old crates and waited for the coast to clear so they could flee.

Cenred, Morgana and Morgause were loudly jeering at the defeat of not only Agent Dragon but also his three sidekicks; the infamous Agent Emrys whom they now knew as Merlin; Agent Lake, Lancelot and Agent Ryder, Gwaine. The four supposed 'best' agents in the entire Excalibur organisation who had fallen for one of the simplest tricks of the trade. The trio were debating what to do with their enemies; how they would kill them and what they would do with the bodies. Gwen was still yet to say a word and Cenred grinned at his double agent.

"I must say I did have my doubts about you but you pulled it off better than I expected. I knew I could count on you." Cenred claimed.

"So that was why you sent her instead of one of us. Arthur would never believe us if we said we wanted to bring down the Agency." Morgana stated.

"Nothing personal ladies though I didn't expect Arthur to fall for you." Cenred commented and Gwen nodded silently.

"That just made it all the sweeter; I actually think I heard his heart break." Morgause sneered. "Who knew it would be this easy?"

"It wasn't easy. The sneaking around trying not to get caught, the lying, the deceit and knowing that people who trusted me were having their trust repaid by my treachery but I suppose it'll be worth it in the end." Gwen replied quietly as she stood up to stretch out a cramp in her leg.

"Oh it will." Cenred agreed and the sisters nodded in agreement. The downfall of Excalibur would not only ensure the death of their enemies but it would also make them very, very rich and the most powerful organisation in the world. It was a new dawn, a new beginning and it was going to be very enjoyable.

"And it seems the end is… NOW!" Gwen yelled as she ducked to the floor. Before Cenred, Morgana or Morgause could react; the masked men and women cocked their guns and aimed them at the three assassins. They were outnumbered ten to one and even if they tried to reach for their weapons; about a dozen bullets would hit them first. Arthur looked at the others in confusion.

"What's going on?" Lance asked.

"Don't know," Gwaine muttered.

"Shush," Arthur hissed as they peered around to watch. Morgana looked stunned, Morgause looked furious and Cenred was quickly piecing together the truth as the three were forced to their knees and handcuffed by various Excalibur spies.

"You treacherous bitch." Cenred spat and Gwen looked at him coldly.

"What say you Cenred, aren't I the most talented little actress you've ever seen?" Gwen mocked as the three of them were led away and Uther unmasked himself and walked over to Gwen who looked around the warehouse, not bothering to watch as her former teammates were taken away, loudly calling threats of dire retribution towards her. Instead Gwen and Uther walked to where the other spies were still crouching and Arthur looked at Gwen and his father in confusion.

"Alright what is going on here?" Arthur asked, certain that at last they would get some answers.

"Gwen has been working as a double agent for us all along. Ever since you brought her here she informed me that her mission wasn't to kill but to infiltrate and we decided to do just that. I warned you that this mission would be the make or break of the Agency and luckily for us, it was the breaking." Uther explained.

"And you couldn't have told us that beforehand why?" Merlin asked.

"We needed it to be as convincing as possible. If I could have, I would've let you in on it from the start. Besides your reactions when I was 'revealed' were real so it was more believable than if you knew I was lying." Gwen answered.

"So what's going to happen now; with the Agency defeated we are technically out of jobs." Gwaine questioned.

"Not necessarily; aside form capturing the agents, we'll need to find a new purpose for Excalibur; it isn't the end. It's the beginning." Uther replied as they left the warehouse and returned to headquarters.

That night Arthur and Gwen lay up in bed, both were apologising profusely to the other; Gwen for not being totally honest and Arthur for believing she was betraying them. As they babbled over the other; they both just burst out laughing and kissed one another. The rest of the night was spent ensuring that the other knew how much they were loved. Arthur fell asleep, his arms wrapped tightly around the woman he loved as again her head was resting on his chest, directly over his heart. The next morning there was a letter lying on the bed beside him.

My dearest Arthur.

I will be brief, time is short. With the Agency shut and the agents either on the run or on the hunt; I shall have to Disappear. Your father and I have arranged everything. By the time you are reading this, I will be a secure, undisclosed location with enough means to ensure I live like a queen for the rest of my life. I'm sorry that I cannot say goodbye in person but last night was my way of saying goodbye. Every touch and kiss and image is stored in my memory and I know I shall never forget. Also I feel that if I had said goodbye in person, I would never stop saying it. I want you to know that I will love you with all my heart until the day I die and that I will never stop being grateful to you. That night when you first kissed me, you set me free. You helped me see that there was still some hope, some goodness in the world. I found that goodness in you and your love. It was you who saved me Arthur; you healed me, strengthened me, helping me find some goodness in me and feel like a true person for the first time since I was a little girl with a loving family. Please tell the others that I am sorry and that I will love them as the three wonderful big brothers they were to me. Maybe someday we might meet again; if so I am already counting the days until it comes.

My love forever, Gwen xx

Arthur read over the letter with a heavy heart but also a determined mind. There was only one thing he could do.

The tropical sun shimmered over the lazily ebbing tide which was drifting backwards and forwards over the golden sand. It was early afternoon yet the beach was almost deserted; the majority of people either too busy in work to school to enjoy themselves. A long figure was standing at the water's edge and didn't react as the soft cissing nose of shifting sand became more and more noticeable and a pair of arms wrapped themselves around her waist and a familiar pair of lips kissed her cheek. Instead she pushed back into the embrace and allowed him to tighten his hold on her. They had only been separated for two days but it had been two days too many for them both. This was what they had been dreaming for, what they had spent hours fantasising and talking about for weeks on end. The danger had passed, their old lives were forgotten and the future was bright. Now they would be happy, now they were free. The woman turned and smiled at the man she loved.

"What took you so long?" Gwen teased as she kissed Arthur.