"Men. We have a new person for the squad. They'll be coming today."

"I still can't believe Severide left." A squad member said with his feet on the table. Shay looked at him intensely before looking away.

"Sorry, I'm late." A short blonde woman walked in with a duffel bag over her shoulder.

"No way." Dawson looked at Casey, who looked like he had seen a ghost.

"What? Who is it?" She questioned

"Matt." The woman had stopped dead in her tracks and just stared at the lieutenant. "Great." She didn't sound too happy.

"Do you two know each other?" Chief looked at them intently, but they didn't speak. "My office now." They followed him into his office, and he shut the door. "What is it? Ex? Old business partner?"

"She's my cousin. And let's just say that part of the family doesn't get along with my side."

"And whys that?"

"They put people in key positions so that the rest of their family in the gang can get away with things."

"That is not true, and you know it!"

Outside the office, others were standing and watching through the glass. "I'm willing to bet one-night stand." Mouch and Herrmann nodded together and continued to watch.

It was Dawson's turn to guess. "I bet they are related somehow." No one seemed to agree.

"No way. They don't even look alike in any way."

Back in the office, Casey was trying to convince the chief that she shouldn't stay at the station. "She can not be trusted."

"Funny. My rank says otherwise." She took a step forward, and the chief put his hands up.

"Enough! I don't care what problems you two have; work them out. Lieutenant Birch is staying because there is a shortage of people. Once we figure something out with the squad, I will transfer her back to her original station. Now get out." The chief sat at his desk, and the cousins left, passing the curious men without saying anything.

Mouch was sitting on the couch with the squad lieutenant. "So. Birch."

"I have a first name, you know."

"What is it, pants?"

She rolled her eyes. "It's Cyra."

"What?" He looked at her with doubt on his face. "That's not a name."

"Excuse me. Anything can be a name. There are people named after cars, so my name isn't that weird. And isn't your name Mouch as in half man half couch?" Casey watched the two talking as he shook his head.

"So, who is she?" Dawson was putting her coffee cup in the sink.

"Oh. Uh, don't worry about it. Okay?" He looked at her with a smile on his face. Her heart fluttered, and she nodded even though she wanted to know who the mystery person was.

Dispatch alerted the ambulance, truck, and squad to an accident. Birch ran to the squad and pulled on her turnout pants and boots before hopping in the passenger seat. The sirens and horns were blaring as the emergency vehicles took off to the accident. Birch shook her head as she saw two people ejected from their cars. She checked their pulses and shook her head. "Two DOA." Shay and Dawson nodded and headed to the five-car pile-up.

Birch kneeled by the door of the Camry that was crushed under the truck's bed. A bloody teenage girl was crying. "Help me! Please! I'm stuck!"

"Hold on. I'm going to get you out." She inspected the door and saw that it wasn't too severely damaged. Although she had to use a little extra force, the door opened relatively easily. The girl reached for her, but she had to stop her. "Wait, stop. Don't move, okay?" Birch tried to stand up to call a paramedic, but the girl clutched onto her arms.

"No! Don't leave me!"

"I'm not. I need to get you a medic." The girl's grip relaxed a little, and Cyra stepped out of the wreck. "Shay! Dawson! I need a medic!" Shay answered her call for help. "I don't know if there are neck injuries."

"All right. Go help the truck open up the doors to the SUV." Birch nodded and walked over to the SUV. Casey was waiting for the Jaws of Life to get the door open. A mother was trapped in the driver's seat, but the kid was in the back seat. His voice was ragged, and he was crying for his mom. Mouch was talking to him, trying to keep him distracted. Birch grabbed a Halligan bar and started to pry open the child's door. It popped open, and Mouch picked him up. At the same time, they freed the mother, and Dawson checked her injuries.

Mouch's name was called out, so the lieutenant was left with the kid. "Hey. Come on now. Stop crying. They got your mom out."

"She's hurt bad. She might not get better." The kid was only about five years old, and his face broke her heart.

"That woman that is checking her for injuries name is Gabby. She is very good at what she does."

"Promise?"

"I promise." The kid wiped his tears, and Birch looked at the cuts on his face. "These aren't bad." Shay was walking in the direction of ambulance 61.

"Dawson!"

"Okay!" She helped the kid's mother stand up and walked her to the other ambulance before hoping in the back of 61.

"Mommy!" The kid ran to her side as she rolled her neck around a little.

"Brian!" Her arms latched onto her son.

"Hey." Birch jumped and turned to face her cousin.

"Holy crap. Don't do that to me."

"Sorry." He gave her a strange look. "I overheard what you said to the kid. How did you know who Dawson was?"

"I read everyone's files. I know about everyone in the station."

"Oh. Great."

"How is the other driver?"

"DOA."

"Half of the people in this crash are dead." Her head started shaking, and she walked off toward the squad. She had her elbow rested on the window as she covered her face.

"Something wrong, boss?" She looked at the driver.

"No." Her face looked blank as she continued. "I never got to introduce myself. I am Lieutenant Cyra Birch, and obviously, I am taking Severide's place for a little while."

"Nice to meet ya. And on behalf of Station 51, welcome." She almost smiled but instead looked out of her window, stress on her features. They returned to the station, and Birch sat in the common area with the others. She was sitting with Mouch and Cruz on the couch.

"Is there nothing else on?"

"I get the same crap from Shay and Dawson. You are in a firehouse full of men; we are going to watch football."

"Whoa, there, bucko. I was going to say the Dolphins suck. We should be watching the Bears game." All the men looked at her, but she was oblivious. Mills smacked the metal bowl he was mixing food in on the counter. She reacted to the noise and saw them. "What?"

"You like football?"

"Duh. My dad raised me like a boy. I thought that was pretty obvious." She raised an eyebrow at Mills.

"Not really."

She shrugged. "Whatever. You just don't know me well enough. Switch the game, Mouch. Don't just sit there with your mouth open like that. It's gross, weird, and rude." He closed his mouth slowly and switched the game.