From Tris' perspective

The same day as chapter 3, but in Amity

It's been five days since Caleb, Amy, and Arnold arrived. Since then, another twenty or so members of Abnegation have trickled in. Though none of them have been people my family was close to, the sight of their grey clothing has been a comfort to me. Like us, they've all been given sanctuary, though I suspect they have had an easier time abiding by the Amity rules. That said, something is being planned now that will almost certainly get us all ousted from Amity, if we're discovered.

Immediately after they got here, Amy went to find her family, and I brought Caleb and Arnold to Katrina. Along with Hana, Uriah, and Shauna, we all gathered around the table in the largest room of the underground oak tree complex.

"I'm going to get right to it," began Arnold. "There are four pieces of evidence that prove that Erudite was behind the attack on Dauntless, and the subsequent attack on Abnegation. First, there is the aggression serum. Caleb has data and video footage documenting the development of the serum, and its testing. First they tested it on the factionless, then they tested it on the few Divergents that they found in Abnegation."

He turned to Caleb, who had been silent so far. Caleb reaches into his pocket and pulled out a data disk.

"Do you have a way of viewing this?"

Hana reached for a datapad and Caleb inserted the disk. He cleared his throat and began to speak. His tone was oddly flat, almost clinical. "Here's the chemical formula and synthesis procedure for the serum. It was quite complex." He flipped through several more files. "Here are the results of the first in vivo tests in rats." He pointed to a scatterplot showing measurements taken at intervals before and after administration. The horizontal axis extended to ninety minutes, but I noticed there were no points after about seven minutes.

"Where's the rest of the data?" I asked him.

Caleb pressed his lips together. "None of the rats survived past then." He flipped to another file. "I think the video will make it clearer." It was horrific. There were 4 rats in a cage, and immediately following injection, they started biting and tearing at each other with their claws. Even after the first one died, the others continued attacking it, and each other.

"I think they get the picture." Arnold said, quietly.

Caleb had nodded and switched to a plot titled "Factionless Subjects".

"They lasted a bit longer," Caleb had explained, pointing to the data, which ended at fifteen minutes.

"You have video of that as well?" Katrina asked.

"Yes," Caleb had answered, his voice barely a whisper. "Do you want to see it?"

I shook my head no. "This is what you were doing when I found you in the lab?"

Caleb wouldn't look me in the eye. "That was one of the Divergents they found in Abnegation. Since there were only a few, Jeanine told us to make sure we didn't kill any of them, so we monitored their cortisol, dopamine, and adrenaline levels, and scanned their brains. They seemed to be more resistant than the factionless subjects, but they were definitely affected."

"Caleb, how could you do this?" I asked.

"I tried to tell you." For just a moment, I saw his mask drop. "It wasn't so bad when it was just the rats. They told us we were studying aggression in order to prevent it."

"But what about the Factionless?"

"They told us if we didn't cooperate, that we'd be Factionless, too. I'm not Dauntless. I'm not Abnegation. I didn't know what to do."

Arnold interrupted, then. "The important thing is that we have this evidence. Now you know about the serum. The next piece of the puzzle is here." He paused to swap data disks. "Beatrice may have told you that the Erudite has been monitoring the other factions?"

Shauna glared at me across the table. "No, she didn't. What does monitoring mean? Spying?"

I could only nod.

"Well, we can deal with that later." Arnold continued. "Right now, just be glad we have proof that Eric tampered with the alcohol at Samhain." The video began, and showed him very clearly emptying vials into each of the barrels, as they were delivered. A second video shows him placing the bomb.

Shauna slammed her fist down on the table. "I knew it. I never trusted him."

"He was handpicked by Jeanine to infiltrate Dauntless. She's been planning this for quite some time. I don't understand why he didn't avoid the cameras, he knew they were there - but he must have thought at this point nobody would be checking them."

"So that's why we all went berserker." Uriah had said.

Yes, and there were a lot more vials. The plan was for continued low-level administration, but Eric never make it back to Dauntless." Caleb explained.

Shauna snapped right back. "We know that part. We killed him."

Caleb and Arnold exchanged glances. "I'm afraid not. He survived, but he's still at Erudite. Jeanine has kept him hidden, and they haven't figured out a way to get him back into Dauntless. They could say he was wounded in the attack on Abnegation, but then he'd have to explain where he's been and who patched him up. We have footage of him in the Erudite infirmary. That's the fourth piece."

"So what's happening in Dauntless now? If Eric isn't there, is it safe for us to go back?" Hana sounded hopeful.

"I honestly don't know. You'd have to have a pretty good story for where you've been all this time. The serum has worn off, and I think Max and the others have started to suspect that it wasn't the Abnegation who attacked them. They're very suspicious," Arnold responded.

"But I don't understand – we could take them this evidence, and then it would be fine." Shauna said.

This time I answered, having already considered that possibility. "You'd have to explain how you got it. Max might think you were involved with Erudite as well."

"So what is the plan, then?" Katrina asked.

"I'm honestly not sure what to do. Caleb and Amy will be staying here, but I have to go back now, or I'll be missed." Arnold said.

"But it's too dangerous! The Amity will let you stay here if you ask." I pleaded with him.

He smiled then. "I can help you more back in Erudite."

"What if Jeanine finds out what you've done? She'll kill you. Or worse."

Arnold sighed. "You reach a point where you're more concerned about the person you've become. Caleb understands that now." Arnold glanced at Caleb, but Caleb could only look away.

Looking at Arnold, I knew the decision had been made and there was no point in trying to persuade him.

"I'll walk you to the train?" I offered.

"I'd like that."

I led him back up the winding stairs. Once we were above ground again, Arnold asked me how Four was.

"I don't know." I had to fight back tears as I answered. It was the first time I'd cried since the night we arrived in Amity.

"What do you mean?"

"He was hurt so badly, he wouldn't have made it to Amity."

"Then where is he?"

"We took him to Evelyn – Four's mother. She's the leader of the factionless. They have a hospital. She took Four, but she made us leave. She blamed us for what happened"

Arnold had been alarmed at this. "What do you mean, leader of the factionless?"

"The Divergents Jeanine was after weren't hiding in Abnegation – they were hiding among the factionless. They're organized, and I think they're planning to go to war."

"Why?"

"They're descendants of the original Divergents. Most of them were banished, but a few were able to enter the City, and over successive generations, they've increased in strength. They want power, and revenge."

Arnold shook his head. "There were always stories - whispers. I never thought they'd turn out to be true. I guess Jeanine wasn't so crazy after all?"

"She's right to fear the Divergents, if that's what mean. But by destroying the Abnegation and destabilizing Dauntless, she may have made it easier for the Factionless Divergent to take over."

"She was always short-sighted."

"Arnold, what's going to happen?"

"I don't know. You have the evidence. I think it's up to the remaining Abnegation to decide what to do with it."

"If it's made public, the Dauntless will attack Erudite. That's two factions gone, without the Divergents having to do anything."

"Maybe that would be a good thing."

"You wouldn't say that if you'd met her, Arnold. Evelyn is ruthless. She'll kill you all – or enslave you."

"Perhaps Four can help?"

"I have no way to contact him…" But then it had come on me. There was a chance. I still had the program Four had written. I had the disk in my pocket, and I gave it to Arnold. "Four wrote this program so I could send a message to him in Dauntless. It piggybacks a signal on the stream from Erudite that monitors the Dauntless mainframe."

Arnold had chuckled at that. "Clever."

"If somehow he makes it back there…"

Arnold finished my sentence for me. "I'll tell him where you are – and what really happened." As if on cue, I could hear the train then, and Arnold had turned away from me and started running toward it. Only when it was so loud that I knew he'd never hear me did I realize that I'd never thanked him. He had saved me, Four, and my brother, and risked his own life to bring us evidence against Erudite. I pray I get the chance to repay him someday.

Though I had my reservations, we had agreed among ourselves that the evidence had to be shared with the Abnegation. To his credit, Caleb had not shied away from revealing his role in the development and testing of the aggression serum. Once we were done, we were met with nothing but silence. Since then, for almost a week, the remaining Abnegation had been locked in debate over what to do with the information.

Our days have been filled with work in the Amity fields. I don't mind. It gives me time to think. And it gives me time to pray - for Four, for Arnold, and for all of us. I'm worried about my brother. He has been staying with Amy and her family, and every time I've tried to talk to him, he's turned and walked away. He's the only family I have left, and I know I need to break down the wall between us. I just don't know how, though. Each night, Uriah, Shauna, and I have stolen away to the grove to train and spar. I hear Shauna crying at night, but she hasn't mentioned Zeke's name once since the funeral. I know she blames me for what happened to him, and she takes it out on me when we fight. I let her. I can feel myself getting stronger, both physically and mentally. I still have a long way to go, though.

All of the Abnegation leaders were killed, except for Marcus, but a woman I knew only a little, Mara, has become the informal leader of the Abnegation in Amity. This morning she approached me, and asked me if it would be possible to create an anonymous broadcast that would be sent to all of the factions.

"In the end, we must choose truth," she had said.

"Even at the expense of peace?" I had countered.

"There can be no true peace without truth." It was an Abnegation teaching, and I should have expected the answer, but I was not comforted by it.

Katrina and the others had been supportive of the idea, and right now, along with the Abnegation, they are recording the message. I will be delivering the transmitter tonight, which will broadcast the message from Abnegation. I am fearful of the events that may be set in motion by this transmission, but also hopeful. In exchange for my delivery of the transmitter, they agreed to insert a small, hand-drawn picture at the beginning of the message. None of them asked me what it meant, and I volunteered no explanation.

A/N Thank you so much for reading! Reviews are like crack to me, truly. Always interesting in hearing your thoughts. Tris has found two ways to try to get a message to Four, hopefully one of them at least will make it!