The silence in the room was only broken by the eerie song coming from the speakers.

We'll meet again...

Don't know where, don't know when

Beckett was looking into Castle's eyes and he noticed that she was really shaken, almost to the point of tears. The song that she was hearing was all she could think about. All Beckett could focus on were the memories of much her dad had listened to this song after her mom had died.

Castle moved forward to catch Kate because her knees had suddenly given out. Castle helped her to the couch, and after she sat down, he started talking about how the case closely followed the two murder victims that looked exactly like Lanie and Espo.

"The only thing that I don't get is how Dr. Neiman is connected to Jerry Tyson", he said, as Kate composed herself on the couch.

"Do you remember, back when we first met Neiman in her office?" he asked

"Why do you ask?" she answered, still more than a little shaken.

"Recall that she tried to give me a pen. There must have been some significance there. I just know it. Could that have somehow been a connection between Neiman and the Lanie look-alike? There must have been one." Castle said, laying his racing thoughts out for Beckett.

"Castle, I don't think so. You're overthinking the whole pen thing, how could that have been a connection?" Beckett said. Castle took the criticism in stride and said nothing, but continued thinking about that pen. There had to be something... he thought

Ryan and Espo, meanwhile, were following their investigation as it led them to an older building in lower Manhattan, just north of Vessy Street. It was some kind of garage, crumbling in some places, and with graffitti on one side. It appeared to be the headquarters of a limosine company. They approached a man who was clearly a dispatcher.

"Excuse me! Detectives Ryan and Esposito, NYPD. We have a few questions for you." Espo said forcefully, as he and Ryan put their badges away.

"Detectives, huh? What do you want?" The man replied. He didn't look very intimidated, but Ryan saw no sign that he wouldn't cooperate.

"Have you seen this man?" Ryan asked, as he opened his coat and took out a picture of 3XK.

"Oh, yeah, I remember him. He looks just like a guy renting office space on the second floor. Except he has a mustache now, and a kind of goatee-thing. Looked like trouble to me, we don't talk much" The dispatcher said.

"Perfect, you've been a big help" Espo said, and then they headed up the stairs. They swept the second floor, but found nothing but chipped walls, dirty floors, and a rat in one of the rooms. 3XK was nowhere in sight. The last room they checked turned out to be the office the dispatcher told them about. There was wire all over the place, and little bits of electronic hardware scattered over the desk.

"Beckett." Ryan said into his phone.

"Please tell me you have something" Beckett pleaded

"Uh, yeah, we found an office that 3XK is renting. But..." Ryan started

"What?" Beckett demanded, her interest piqued

"There's a bunch of electrical materials here. Bomb-Making equipment." Ryan said.

"But that doesn't fit Tyson's MO... I'm sending help, just make sure that every single thing in that office gets marked as high priority evidence. Good work." Beckett said before hanging up.