AN: Alright everybody! I've had so many helpful ideas throughout my other two stories that I decided I needed to write another story to use all of those ideas! I'm still working on Completion so don't you worry! But this story has been on my mind for a while so I decided to start it already!

Without further ado, Irrevocable!

Chapter 1

Andy walked into 15 Division and felt an overwhelming sense of home. She had missed it for the 6 months that she had spent undercover with Nick. Her shoes clicked familiarly on the floor and Andy couldn't help the smile that spread across her face.

She walked through the bullpen and entered the women's locker room. She went to her old locker and turned the dial in the familiar pattern and it clicked and swung open. She hung her duffle bag on the hook inside and removed her hoodie and hung up it as well.

She quickly changed into her uniform, buttoning up the shirt, fastening her pants, sliding on her shoes and attaching her belt. She slid on her Kevlar vest and finally attached her name to the Velcro strip on her chest. She tied her hair in a ponytail and shut her locker.

She was more than ready to come back.

She glanced at herself in the mirror and then stepped out of the locker room.

Andy made her way to the bullpen where all of the officers were gathered before parade started and found Dov standing by the coffee station with a young woman that Andy did not recognize.

"Hey Dov," Andy said as she reached past him to pour herself a coffee.

"Morning Andy," he replied easily, still in conversation with the brunette.

Andy had enough time to finish pouring her coffee and adding her usual milk before Dov froze in the middle of his conversation.

"Dov?" asked the girl, "Are you-?"

"Andy?" Dov demanded, swivelling his head to look at her.

Andy smiled at him.

"You're back!" he exclaimed, "Hi!"

"Hey you," Andy said with a laugh, wrapping her arms around her friend.

"So you did go undercover with Callaghan's task force," Dov said once they had finished hugging, "I knew it!"

Andy nodded. "I did," she said, "Collins too."

"Where is that guy?" Dov asked, looking around.

"Probably sleeping in," Andy laughed, shaking her head. She turned to the brunette girl she did not know, "I'm sorry, I don't know who you are?"

"Chloe Price," said the woman, holding out her hand to shake Andy's.

"Andy McNally," Andy said, shaking it firmly, "Are you a new rookie?"

Price nodded.

"Who's your training officer?" Andy asked.

"Oliver Shaw," Chloe replied.

"Oh good," Andy said, "He's a good cop."

Chloe nodded. "I've heard that you are too Officer McNally," she nodded.

Andy gave her a smile. "Thanks Price," she said. She glanced at Dov. "Where is everyone?"

"Like?" Dov asked.

"Chris?" Andy asked.

"Transferred to Timmins to be with Denise," Dov said with a frown, "Last I heard they were going through a rough patch…"

Andy sighed and patted Dov on the back. "Maybe he'll come back," she said as Frank called for parade, "Come on, let's go. We can't be a bad example for the new Rookie." She smiled at Chloe and led the way to the parade room.

"Alright guys," Frank said, "As you all know, there's been some dirty ecstasy on the streets recently. Two people have died in the last week. So keep a watchful eye out for any drug deals, people shooting up, anything. Take notes and we'll pass it along to the overnight shift as well. Be sure you have eyes everywhere," Frank said, "That being said, I want to welcome back Officer Andy McNally and Officer Nick Collins, back from Detective Callaghan's task force. They will both be put back into the rotation right away."

Andy felt her face flush slightly as she nodded at the Staff Sargent.

He smiled back. "Welcome back guys. Good work out there," he said, "Alright. We'll have Williams and Peck,"

"Gail is still here?" Andy hissed under her breath to Dov, "I thought she got fired before we left?"

"Nope. Has to ride with a T.O for the rest of the year, but she's on full duty," Dov replied under his breath.

"Huh," Andy replied, crossing her arms, "Weird."

"Shaw and Price. Epstein and Cruz. Collins and Swarek. McNally, you'll be riding alone today," Frank finished, "Any problems, let me know. Have a good day guys. Serve, protect and don't do drugs."

"Who's Cruz?" Andy asked as people filtered out of the parade room, "Another new rookie?"

"Ex-SWAT negotiator," Dov replied in a low voice, "She's badass actually. Went to the academy with Swarek about a billion years ago."

"I'm not that old Epstein," joked another woman that Andy didn't recognize, "McNally, was it?" she asked Andy, extending a hand, "It's good to have you back."

Andy shook her hand, "Cruz? You can call me Andy.

"Marlo," she corrected with a smile.

Andy returned it easily. She was pretty woman with long dark hair, tanned skin and exotic features. "Well it's great to meet you Marlo," Andy said.

"You too Andy," she said with a smile.

Andy tilted her head over her shoulder and said, "I'd better be going. I need to have a quick word with Frank before I head out."

"Of course," Marlo said, "See you later Andy."

"Talk to you soon," Andy said, "Have a good day guys!" She spun on her heel and ran right into a hard male chest. "Oof!" she gasped out, surprised, almost spilling her coffee.

"Sorry," said an all too familiar voice.

Andy's eyes shot up to take in Sam's face. "My fault," she breathed out with an awkward smile.

They were both silent for a long moment and then Sam cleared his throat.

"Right," Andy said. She side-stepped him quickly and then hurried away towards Frank's office, heart pounding away in her throat.

AN: I hope you enjoyed it!