The drive to CalSci was done in silence. Once there Megan and Don got out and headed toward the math building and Charlie's office. Just outside Charlie's office Don realized Megan had stopped a few feet back. He looked back at her with a question in his eyes. Megan nodded toward the door.

"You go ahead first." Don realized Megan wanted him to go first so he could make his peace with his brother. Don sighed. He hoped he could. He opened the door of his brother's office and quietly walked in. He saw Charlie immedieatly standing at the chalkboard writing frenetically.

"Charlie?" Don spoke quietly. Charlie's head came around he looked at Don through red, swollen eyes.

"What do you want? I won't stop working on it. I won't let you make me stop." Charlie's voice rose with emotion. Don realized though Charlie was looking at him, he wasn't seeing him. Don quickly came to stand by Charlie.

" I came to apologize. We're both frustrated and.." Don stopped and swallowed. "I got a phone call telling me not to involve you on the case. That Dad's life depended on it..I'm so sorry Charlie. I'm sorry for hurting you." Charlie looked at Don.

"I miss Dad. Are we going to get him back, Don?" Tears welled again in Charlie's eyes. Don quietly reached for Charlie and pulled him against him as Charlie's tears fell silently. After Charlie had calmed down he looked at Don.

"I have to help. You have to let me help. Please Don, I can't let Dad die." A new voice from the doorway interrupted Don's reply.

"You can help me find him Charlie. I'll involve you, not Don." Megan stepped into the room. Charlie and Don both stood and Charlie looked at the file in Megan's hands.

"What is it?"

"It came for Don. It's numbers." Charlie smiled for the first time in days and reached for it. He sat in his office chair and silently studied the printed sheets.

"Do you think you can find out what they are?" Asked Don. Charlie looked up and regarded Don solemnly then turned and looked at the equations he had been working on. Equations now useless with the information he held in his hands.

"I know what they are. I just don't get it. These numbers are all UPC codes for college textbooks. A few I recognize as math texts, the others I might have to run by the campus bookstore. Why would Dad's kidnapper send us UPC numbers for textbooks?" Don and Megan both shrugged, all three of them confused and feeling helpless. Don's phone rang.

"Eppes?" He answered wearily.

"Don, it's David. We found Mitchell."

"Are you bringing him in?" Don all but leaped from the chair he had sat in.

"We can't Don. He's dead. There's a note left here." David got interrupted.

"Remeber Albuquerque?" Don asked harshly.

"Yes. We'll finish up here and meet you back at the office." David hesitated. "Charlie?" Don couldn't help but smile.

"The numbers are UPC codes for textbooks. We'll meet you at the office." Don ended the call and he, Megan, and Charlie headed for the door.

Alan Eppes rubbed his face wearily. The same prison, the same disembodied voice, though it had been quiet for several hours, was now haunting him when he dozed off. He was beginning to lose hope. He wanted to be home, to see his sons, to cook. He couldn't though. He could barely make out his prison. He reached for the half emtpy waterbottle and swallowed some.

"Returning to the land of the living, Alan?" Alan jumped at the sudden return of the voice. He didn't reply, instead chose to stare at the wall.

"Silent now. I have a question for you. Your two sons are smart. But I can tear them apart, pit them against each other, make them begin to hate each other.." Alan interrupted the voice in horror.

"NO! They would never hate each other. They may not always see eye to eye with each other, but they would never hate each other!"

"We'll see about that won't we. Once Agent Eppes remembers Albuquerque, we'll see if your prediction comes true or if mine does. Now doesn't that sound fun?"