Author's Note: Hi everyone! Just a quick note to say after the 23rd of June updates will be more frequent. But anyway, thank you all for reading. Hope you enjoy the chapter!

Spoiler Alert: CONTAINS SPOILERS FOR THE 200TH EPISODE

Context: Despite the fact that this is AU, the events of the 200th episode have still occured. Mackenzie is still unaware of these events.

Chapter 4: OLD ENEMIES

Mackenzie walked into the hotel room she was sharing with JJ quickly closing the door behind her. The rest of the team were still downstairs eating dinner and would be up soon. It was late, nearly eleven o'clock but she had wanted to call Dante. She hadn't had a chance to tell him she had a case yet. Garcia hadn't managed to crack Mackenzie's phone so she'd given it back to her for the night, which Mackenzie was thankful for. She quickly the hit speed dial for Dante.

"Hello?" Dante's voice came across the phone sounding tired.

"Hey, Dante, it's Mackenzie. Sorry for calling you so late. I didn't wake you did I?" Mackenzie said, sitting down on the chair in the corner of the hotel room.

"No, its fine. I only just got in. I was going to call you. Where are you? I thought you would have gotten back by home by now."

"I'm in Charleston. We got a case. Sorry for not calling you sooner. I haven't had the chance."

"It's okay, I'm not annoyed. I'm just relieved I now know where you are," Dante said.

"Sorry again."

"Mackenzie, really, it's fine. We knew this was going to happen at some point. You do work as a profiler now which involves a lot of travelling. But there is a good thing about you being in Charleston..."

"And what might that be?" Mackenzie asked confused.

"Charleston is only two hours away. I can come up and keep you company," He said happily.

"As much as I love that idea, I don't think that's appropriate. I'm working and, even if you were allowed to come down, you wouldn't be seeing me much. I'll be mostly at the precinct," Mackenzie said disappointed. "This job is also way more dangerous than my old one. I don't want you getting hurt."

"I know. It was just an idea," He replied quietly. "Now I just wish that I had kissed you longer and held you tighter this morning."

"Dante, if you had held me tighter I would have had broken bones. But I do see where you're coming from," Mackenzie laughed.

"Do you have any idea how long the case will be?" He asked.

"I can't be sure at this point. We don't have very many leads at the minute so it's hard to say," Mackenzie replied.

"Now I really wish I kissed you longer now that I don't know when I'll see you again."

"Oh and made me late for my first day on the job? I don't think so," Mackenzie teased.

"I think it's a valid excuse."

"Yeah I'm hardly going to go up to my boss and say, 'Hey, sorry I'm late. I was making out with my fiancé'," Mackenzie shot back playfully. Just as she had said it, JJ had walked in and stood in the door way with raised eyebrows. Mackenzie's face went bright red. "Dante, I'm going to have to go. JJ just came in."

"No problem. Thanks for calling Kenzie," Dante said, chuckling at the awkwardness in Mackenzie's voice.

"No problem. Talk to you later."

"Love you."

"Love you too. Bye"

With that Mackenzie hung up the phone and faced JJ. "You heard the wrong part of that conversation."

"Of course I did. But what I did hear was absolutely adorable," JJ said causing Mackenzie to blush again. With a smirk JJ continued, "Mackenzie and Dante sitting in a tree, K-I-S-S..."

"You're so immature!" Mackenzie said rolling her eyes but couldn't help laughing at JJ's antics.

"I think it's time we turned in. We have an early start tomorrow," JJ said once they stopped laughing.

"Agreed," Mackenzie said.

And with that the two women turned in for the night.

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The next few days brought up no new leads. The team worked hard on the little evidence they had but nothing seemed to break. Garcia was unable to track the unknown number and the rest of the team were unable to get anything else from the description of the woman seen at the scene or the profile. Nothing was working. Nothing was sticking. That was until the Friday morning.

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The team sat around the conference table continually looking over the very little evidence they had. It had been the same for the previous three days and Hotch was getting close to declaring it a cold case. Suddenly there was a knock on the door.

"Come in," Hotch said.

A young officer, looking to be in his early twenties, walked through the door holding a brown package. He was tall and well built with black hair and brown eyes.

"Agent Hotchner, this arrived for you and your team this morning," He said.

"What is it?" Hotch asked.

"We don't know. We brought it here straight away."

"Okay, thank you officer," Hotch said taking the package. And with that the officer left.

The team watched in curiosity as Hotch opened the package and pulled out a CD case. Inside was a disc with the words 'Watch This' written in neat script with black pen. Hotch got up and walked over to the plasma screen in the conference room which was connected to a DVD player. He switched both on and placed the disc in the player. He hit play and sat back down.

On the screen appeared a woman with dark brown hair and pale blue eyes. She seemed to be in her late thirties and the team (excluding Blake and Mackenzie) felt they recognised her from somewhere but had no clue where from.

"You're probably wondering who I am," The woman said. She had a thick Irish accent. Mackenzie and Blake noticed at the sound of her voice that Morgan clenched his fists.

"You've never heard of me before let alone met me but I know you know who my brother was. Spencer Reid killed him two years ago, remember?" She continued.

Reid gulped and Mackenzie saw all the colour drain from Garcia and JJ faces. Blake kept her eyes on Hotch and Rossi who had both kept their stoic appearances.

"Three years ago my brother went after Lauren, I.E Emily Prentiss. He supposedly killed her but then little under a year later she returned and took him down and saved Declan. Now both my brother and Chloe Donaghy are dead by the hands of the FBI."

Mackenzie's confusion grew and Blake's even more so due to the mentioning of Emily Prentiss. She remembered her clearly from JJ's kidnapping. The rest of the team had gone pale, including Hotch and Rossi who had lost their composure.

"My name is Meaghan Doyle. Sister of the infamous Ian Doyle. And I'm out for revenge."

With that the screen went black. The team stared at it blankly making Mackenzie and Blake's confusion grow. They finally snapped.

"Who's Ian Doyle?" Mackenzie asked.

"And what does Prentiss have to do with it?" Blake continued.

Hotch sighed. "Ian Doyle was an IRA terrorist turned serial killer. Emily, before the FBI, worked for Interpol. She was sent to work undercover against Doyle to bring him down. Three years ago Doyle found, tortured and stabbed her and she had to fake her death. About eight months later we found Doyle again as he was looking for his son Declan. At the same time Declan's mother, Chloe Donaghy, was trying to find her son to get at Doyle. The case ended with Donaghy, Donaghy's partner and Doyle dead."

Blake's eyes widened at this new information but Mackenzie just grew even more confused.

"Who's Emily Prentiss?"

"Evans, we'll have someone explain all this later when we have time, but for now we need to find this woman. If she is as dangerous as her brother we are in a lot of trouble," Hotch said turning to Garcia. "Garcia I need you to get all the case files about Doyle and the case files from two years ago along with all the information you can get on Meaghan Doyle."

"Yes sir," Garcia said nodding as she tried to focus. Her voice was full of fear.

"I'm away to make a phone call but I'll be back soon," Hotch said pulling out his phone. "We need to get Emily down here as soon as possible.