Walter stood with his hands in his pockets over the man Cabe brought in and looked at him without blinking. The longer he stood there, the more nervous the man became.

"Good Walter. Now just walk a little closer to him" Toby coached. Cabe had set up a live feed in the room they were interrogating in so Toby could watch from his phone. It had been decided that Walter should talk with the suspect since he knew Collins best. "Slam your fist on the table and then yell. He should be good to go after that." Walter did exactly as Toby suggested, causing the man to jump. Walter smiled inwardly.

"Now you're going to tell us everything!" Walter yelled. "We know about the stock market manipulation, we know that at any moment this whole place is going to blow when a conduit is opened up and electricity overloads the system. And we know who is behind all this."

"Excellent Walter! You've got him right where you want him. Pull up a chair, sit down and continue keeping eye contact." Walter did so.

"Okay okay. The man said nervously.

"What's your name?"

"Jackson."

"Uh huh."

"Look. I was approached by a guy because of my black market explosives background, and he said he had a job which would make me millions. I've been clean since getting out of prison, but no one would hire me and I needed the money."

"Is this the man that contacted you?" Walter showed him a picture of Collins.

"Yeah. That's the one. Crazy as hell."

"His name is Mark Collins. Why do you say that?"

"He muttered to himself a lot, kept calling us idiots. He would often say 'he'll love my surprise. Just wait until he gets my surprise.'"

"Was he talking about me?" Walter asked.

"I don't know. Like I said, he was crazy."

"How did he get in contact with the stock brokers?"

"I don't know. I only knew about what I was supposed to do, which was to get a man named David who worked for the subway. This David guy had subway plans that we were going to use as a guide to place the explosives. But I never set anything up. Collins just, disappeared."

"Do you know where the broadcast signal is?"

"No I don't."

"You do realize that this whole place is going to blow if you don't help us take Collins down."

"Look, I already said I wasn't told that information. But If I had to guess, it would be somewhere close, high up so the signal could reach the other station." Cabe came in and motioned for Walter to come outside.

"Walter he's telling the truth. He doesn't know anything and my guess is the other guys don't either" Toby said over the coms.

"Sylvester keep scanning the surveillance feed for the other guys Collins hired. We still need to catch them in any case."

"So why grab David if it was all a sham?" Cabe asked.

"Because he knew that taking a civil engineer who was tasked to look into possible terrorist attack scenarios would interest Homeland." Walter shook his head. "It was his play all along. He wanted me to be on this case, and he calculated for every step."

"Walter there was just a huge change in stock market sales. They are skyrocketing. I think Collins has moved up the time table. He must be monitoring what's going on. We've only got 10 minutes left!" Sylvester shouted. Walter and Cabe locked eyes.

"David what's our status on the energy readings?"

"I'm just getting there now Walter. Give me one second."

"We don't have a second!"

"I can't look this up any faster. Okay I've got it. There was a false output reading on the computer to make it seem like everything was normal. It's bad Walter. The system is at maximum capacity. It can go at any time."

"Can we just shut the station down?" Cabe suggested.

"No." Walter said firmly. "These stations have reserves in the event of a power outage. Shutting it down would just turn on the emergency backup generators which will divert the power and cause the explosion."

"Happy? Where would Collins have put the signal that is going to open the conduits?"

"He needs a stable building close enough to the tracks."

"Try the Standard LA Hotel" Toby suggested. "It's tall enough, one block away and nobody asks questions about who is going in and out of the building."

"Thanks. Happy, Toby, take a look on your end and figure out if there is a backup signal."

"I'm coming with you" Cabe said to Walter.

They both ran as fast as they could, the time ticking in Walters mind. 7 minutes left he thought when they got to street level. By the time they made it to the hotel another minute had gone by. 6 minutes. "National Security!" Cabe said waving his badge "Hold the elevator!" Walter was out of breath but he could feel the adrenaline take over his system.

"Happy? Any luck with finding a backup signal?"

"No Walter. Toby went to look at the roof of the station since there aren't a lot of high buildings here. I'm looking at the wires trying to see if I can reroute the power. Maybe if we can't stop it, we can still keep the stations from blowing up." 5 minutes.

"Okay." The elevator opened and Walter charged out, Cabe close behind him. They ran towards the stairwell and pushed through the emergency door which lead to the roof. Walter immediately saw a satellite dish with a computer hooked up to it.

"That must be it!" He shouted to Cabe.

"Do what you need to, I'll stop the security guys from interrupting you."

He touched the computer pad, which promptly booted it. Complex computer code scrolled across the screen. Walter deciphered it and put together the message.

Hello Walter. Are you ready to play a game with me? More numbers flashed. Don't think about unhooking the computer, or trying to hack this program. Everything will blow up if you do.

Walter wrote back in the same code Mark where are you? You've got to stop this. Nothing is accomplished by putting everyone's lives at risk.

No questions or you'll mess with the programming. Anything else you type other than the correct answer will result in the conduit being opened. Walter understood then that Collins wasn't actually on the other end, he had just accounted for everything Walter would say.

"I've found the source of the signal. Collins has written a computer program with questions I have to answer. If I get any of them wrong it will result in the system overload." Walter could feel sweat bead on his forehead.

"You've got this." Paige said calmly. Her voice gave him the extra push he needed to focus. 3 minutes.

Shall we begin?

Walter typed as fast as he could in response to every question Collins had for him. They ranged from dates, names, and formulas to his knowledge on radio signals. Each formula, each question became more difficult. 2 minutes.

Very good Walter. Now for the final question.

"Final question!" He said out loud.

What was the day your life changed? Walter stopped. He wasn't sure what Collins was getting at. There were so many significant days. The day he hacked NASA, the day he decided to create Scorpion, the day he sent Collins away, The day Cabe came back into his life the second time, the day Megan got diagnosed. Somehow, none of it made sense. 1 minute.

"One minute!" Sylvester said.

Suddenly, Walter knew what the date was. It was the day Ralph and Paige came into his life. He wasn't sure how Collins knew that, but it was the only thing he could think of. He paused for just a moment, and then entered the date. The computer when blank, then more code scrolled across the screen.

Thank you Walter. Here's your reward. Until next time.

"It's over." Walter breathed.

On the computer several files popped up, all having to do with how the stock market was manipulated and who was involved.

"Collins gave us everything."

"What do you mean?" Happy asked.

"The guilty parties in the investment firms, recordings, emails, files. "

"Why would he do that?" Cabe asked.

"I won the game."

"We're heading back to the garage. I've secured a ride for us. Happy, Toby, we'll pick you up."