Danny walked into Greg and Alison's apartment. No one in the family had seen him outside of work for over a month. Whenever they tried to see him, he would come up with an excuse. So it was determined that Danny would go and see him. Alison had been gone for months. She was most likely dead by now. The only hope they had was that they hadn't found her body yet, or the body of any new victims. Alison was the one victim that the man kept the longest. The others he only kept for a few weeks. There was something about Alison that made this monster deviate from his typical pattern.

"Greg, you home," Danny called out, but he didn't hear a response. Walking further into the apartment. He looked around, seeing several empty containers of food lying around, marking how Greg was handling Alison's absence. He had always seemed fine when he came to Sunday dinner, but after Messer's kid was born, something changed. Danny passed the office, heading toward the main room when something caught his eye. He found a full crime board with all the evidence from Alison's case laid out in the office. There were posted notes all over the walls and floor. Getting a closer look, he found they were names of people and a mark next to their names.

"See something you like." Danny jumped, turning around, finding Greg leaning against the door. His eyes were bloodshot, and there was a sense of desperation.

"What are these," Danny asked, holding up one of the notes. Greg walked over, grabbing it out of his hand and placing it back on its spot on the wall.

"It's nothing now. Do you need anything? If not, I have to go to work." Greg said, using his height to his advantage. Danny stood his ground.

"What is this, Greg." Danny pressed him, not backing down. Greg walked out of the office with Danny close behind. He walked into the kitchen, grabbing his cane.

"Alison was found in an abandoned building across from a medical center. That center has 20 different locations in the city. Those notes are of the patients that have died in the past 6 years." Greg explained, letting out a deep sigh. Danny looked back at the office.

"You have checked all of them. Why," Dany asked.

"Because there is no way that Alison surviving wasn't intentional. He is so methodical in everything that he does." Greg explained, shaking his head. "I started with the location she was found by then moved out." Danny leaned forward.

"There must be hundreds of names."

"I need to find her, Danny." Greg's voice trailed off.

"Greg, you can't live like this."

"I…I can't live like this. How is Alison living." Danny watched him as he looked at his phone. "I have to go." Greg grabbed his bag at the door, not bothering to say goodbye. Danny walked back into the office, looking over the map Greg had made. There was a pattern to it that Danny couldn't put his finger on. He slowly followed the trail pulling out his phone.

"Detective Taylor."

"Hey, Mac, did you know Greg was looking into Alison's case." Danny asked; Mac let out a deep breath.

"I gave him the file a while back, but I didn't think it was going to spiral like this. Has he talked to you about it?" Danny stepped back, looking at the office.

"Can you come by his apartment? I want you to see something." There was a long pause.

"I'm on my way."

Danny opened the door, letting Mac into the apartment.

"It's in here." Danny led him into the office. Mac looked over the walls then the floors.

"He's covered most of their patients." Danny looked at him.

"How can you tell." Mac pointed at the notes.

"I've seen him do a similar tactic for another case. The way it trails up the walls and floors shows their relation to locations."

"But he hasn't found anything." Mac shook his head, then picked up one of the notes.

"But, this is interesting," Mac said, putting it in his pocket.

"What is it."

"No, I want to look this over first. Keep an eye on him." With that, Mac left Danny alone.

Flack walked into Mac's office.

"I got your message. What is this about? It seemed important." Mac held up a posted note.

"You can't react because Greg is in the lab behind you. I think that file nine might just have caught a break." Flack caught himself, slowly walking over to the table, sitting across from him. Taking the note from him. His eyes shot up.

"Dr. John Whitworth. Why does this name look familiar." Mac closed his eyes.

"It's the name of the doctor that helped save Alison." Flack's eyes shot back to the note.

"I thought we cleared him." Mac leaned forward.

"We did, or so I thought, but Greg found a list of 8 patients that died in the past 6 years." Flack closed his eyes.

"You mean that while he hasn't been killing women, he's been after patients." Mac held up his hands.

"We don't know that, but I think it's interesting that all 8 died after getting a shot from him. And none of the other doctors have that type of record. They're far enough apart that it's not a clear pattern, but it's there." Flack nodded, taking a deep breath.

"I think we need to look into him a lot closer. I have Hawkes pulling up the information he can on possible locations he could be holding Alison." There was a knock on the door. The two looked up with excitement, but it was Greg. Mac cleared his throat.

"Mac, I got called to a scene, but I can't find Hawkes." Flack looked over at Mac.

"Take Adam with you. Hawkes got pulled into another case." Greg tilted his head then gave a small nod. Turning and walking away. Flack stood up.

"Why didn't you tell him. It's Alison." Mac stood up.

"Because Greg has been through enough. I don't want to give him false hope." Flack waved him off, looking over the file. About 20 minutes later, Hawkes burst through the door.

"Mac! The building where the party Alison was walking home from 10 years ago. The Doctor owns it. We didn't catch it the first time because it's under his dead wife's mother's maiden name." Mac grabbed his coat.

"It's not much, but it's enough to get a warrant. Just be sure Erin doesn't hear about it."

Alison stared at the small piece of metal. It couldn't be. She turned it in her hand, being careful not to get her hopes up. Could she even do this? Her body was broken. Alison closed her eyes, storing up all the energy she had. Reaching down to her ankle, she gripped the lock. This would only take a minute. It was the door that could prove challenging. Her only hope was that he wasn't watching the cameras. There was a click, and she moved. Her body was stiff, and she almost fell over, but she braced herself against the wall. She kept her heart rate low, relaxing her breathing. The minute her heartrate picked up, it would be too late. He would come whenever it got too high or cut out. Using the small piece of metal that she had taken from the food tray's inner line, she picked the lock. She had been slowly working out, and on the last dish, it had finally come free. She breathed in and out. The sound of the machine she once feared was now giving her a chance at freedom. She only hoped that she would live long enough to see it. The lock clicked, and Alison froze. She wasn't finished. Meaning he was back, and she was going to die.

Mac and Flack went over the plain with the team leader.

"Don't you think we should tell someone," Flack asked.

"We got the warrant from the DA's office. I'm not going to tell any of the Reagan's until we have eyes on Alison." Flack nodded. The door to the van opened up, and Danny Reagan walked in.

"Reagan, what are you doing here." Danny crossed his arms.

"Did you really think I wouldn't be here. that's my kid sister. I'm going in." Flack looked at Mac. He nodded, knowing there was no use in fighting him.

"Okay, so we enter through the front and back. Now we need this to be clean if we don't find Alison." Flack adjusted the straps to his vest.

"Let go save our girl."