"Death serum?" I choke out. I'm surprised my voice is even audible. My hands tremble lightly, and my heart rate increases twofold. I feel faint as memories of last New Year's Eve wash over me. The only thing holding me up at this moment is Tobias' arm firmly around my waist. I know the hell of fighting off death serum first hand. Poor Sam and Harrison. They weren't able to survive.

"Tris, love, please sit down," Tobias whispers in my ear as he pulls a barstool out for me. I thank him as I lower myself onto the wooden chair. I expect him to move his arm but he keeps it in place. "What exactly do you mean by advanced death serum, Zander?"

"This is where things get a bit dicey, Four," he says as he turns around and starts fitfully pacing in front of the closed door while anxiously running a hand through his hair. "Sam and Harrison were both without a doubt poisoned. The problem is I have no idea what killed them. The toxicology report is all over the map. I've never seen anything quite like it before in my entire life, and I've been doing this a long time. What I do know is that one of the active ingredients from death serum is on the toxicology report. That's why I say advanced death serum." Tobias slides his hand into mine and squeezes it almost painfully. We have a maniac out there injecting random people with something that is guaranteed to kill them. I blow out the breath I'm holding when my lungs start burning painfully. I think we're all at a loss for words.

"I'm going to Harrison's office to see if I can find what he wanted to tell you, Four. It's obvious to me that he learned something about Sam's death that threatened the killer. I'll have Simon and Tony start on his apartment," Tori says in one breath, her word running together. She turns and is out the door before any of us can react.

"I agree with her," Will says. "Whoever killed Sam found out about Harrison's investigation, whatever that might be. It's the only thing that makes sense. If you don't need me for anything else, I'll head to the Pit."

"I think that's it for now," Tobias says. "But before you go home for the night, would you send me an update on what you learn today."

"You got it," he says. He reaches his hand out and Tobias shakes it then he too heads out the door.

"Zeke, why don't you go on ahead to the control room," Tobias says. "I'll meet up with you as soon as I'm finished here. I need a minute with Zander."

"Alright, Four," he says. After the door closes behind him, Tobias flips the lock.

"Death serum?" I say again. I'm having trouble believing this.

"What aren't you telling us?" Tobias says. I look up over my shoulder at him. What's he talking about?

"How did you know?" Zander asks, narrowing his eyes at us.

"I'd like to think we're good friends," Tobias says. "So what else is there?"

"Death serum isn't the only serum I identified but I don't know what it means," he says. He pulls out a new sheet of paper and hands it to Tobias. "I also isolated the active ingredients in a simulation serum but it isn't the same makeup of the simulation serum we use here."

"Ours is the only simulation serum," Tobias says. "Isn't it?" It's like a lightbulb goes off in my head, and I jump up, startling both Tobias and Zander.

"It can't be, can it?" I turn and look at my husband. My head starts throbbing painfully as my heart hammers in my chest. "They said it was all destroyed." I notice my voice climb with each syllable until I think only a dog can hear it.

"What are you talking about?" Zander asks. I watch Tobias' face morph from confused to knowing. He starts pacing while he runs his hands restlessly through his hair. "Four? Tris?"

"I think Tris is talking about the simulation serum Erudite wanted to use on Dauntless to overthrow Abnegation but her father told us it was all destroyed."

"That actually is the first thing about this situation that makes any sense," Zander says rubbing his stubble-covered chin between his thumb and forefinger. He takes the paper out of Tobias' hand and studies it carefully. "Tris, you're absolutely correct about your assumption. The transmitters are what's different. I can't believe I missed it."

"Why would someone combine serums? What's the motive?" I ponder out loud.

"I have no idea," Zander says. "If you give a person death serum, it's going to kill them. Well, unless it's you. I have no idea what motive a person would have to combine serums."

"This is a nightmare," I say. "We should warn people."

"I'm not sure about that," Tobias says.

"Why not?" I ask, interrupting his thought.

"First of all, warn people about what exactly? We don't know anything. Not really. If we tell the members that an unknown subject is running round poisoning people, we are going to have panic on our hands."

"I guess you're right," I say. "Do we tell the others about this?"

"I think we have to," he says.

"I've got to get back to the infirmary," Zander says. "I have patients to see."

"I know this might be a lot to ask, but can you work on identifying every compound on that report and what it does exactly?" Tobias asks. "We need this information sooner rather than later."

"I will make it my priority in between patients," he says. "Do you mind if I take a sample to Erudite and have them test it?"

"I'd rather everything be done in house but if you hit a wall, do what you need to do," Tobias says. "Just keep me posted." I sway into his side, suddenly lightheaded, and he helps me sit down on the couch.

"Are you feeling okay, Tris?" Zander asks.

"Just a bit dizzy," I say. "It's probably the stress."

"Relax," Zander says as he kneels down in front of me. He picks up my left hand, which is resting in my lap and puts his fingertips on the pulse point of my wrist. "Your pulse is very high. Have you noticed any changes in the baby's movement?"

"She's still right now," I slowly say, now beginning to worry about Peanut.

"Can you work from home?" he asks.

"She sure can," Tobias says for me.

"I'd like you to rest," he says. "I'll send Marlene or Isobel to check on you this afternoon. Keep track of the baby's movement."

"Okay," I say, worry now making my stomach ache.

"If you need me, Tris, just call me. I'll see you guys later," he says, his hand on the doorknob. After the door closes behind him, I let out the defeated feelings I've been holding in. Tears start streaming down my face and my breath comes faster and faster.

"Tris, love, please calm down," Tobias says. He sits down on the sofa next to me and cups my cheeks between his palms and puts his face in mine. "Breathe with me. Slow and easy." I do my best to match him breath for breath and after a couple minutes, I finally feel myself calming down. He moves his hands and wraps his arms around me. I collapse against him.

"We have a killer running around Dauntless who wants to be some sort of mad scientist, someone has been coming into our home messing with us, and now I can't even keep our little Peanut safe. I'm such a failure," I sob into his shoulder.

"I don't want to hear you say anything like that ever again," Tobias firmly says. "You're not a failure."

"I'm sick of all this shit," I grumble. "It's been one year of nothing but trouble."

"Nothing?" he asks, his tone … off. I lift my head and look at him. He's trying to hide his feelings but I can see it. It's subtle but I just hurt his feelings.

"That's not entirely true," I say. I gently caress his face with the back of my fingers. "I met you. It was one of the best days of my life. We fell in love, which is a miracle in itself. Who knew we would find our other halves when we joined Dauntless. I gave you my heart and my body, and you gave me our little Peanut." I run my hand over my rounded abdomen, and he covers it with his. When I feel her move, a weight lifts. "The day you made me your wife is the happiest day of my life. Nothing will ever compare but it is only slightly above the days we signed Tyler and Tessa's adoption papers making them ours."

"That's quite an eventful year, Mrs. Eaton," he says.

"Yes, it is, Mr. Eaton," I say. "I'm sorry I hurt your feelings."

"You didn't."

"Don't lie to me, Tobias," I say.

"Alright. It smarted … a little," he says.

"I'm sorry I've been all over the place this morning," I say. "I don't really feel quite like myself today."

"Hormones?"

"Yeah. It should actually be a four letter word," I grumpily joke.

"I really need to get going," he says. "I'll go down to my office and get the Candor files for you."

"I love you, Tobias," I say. I grab his head and pull his lips to mine. We move them together gently at first but when the passion becomes almost too much to bear, he drags his lips away.

"I love you, too, Tris," he pants breathlessly. "Bed or couch?"

"What?"

"Do you want to spend the day in bed or on the couch?"

"Oh," I say, disappointment obvious in my voice. I glance up at him through my lashes and he smirks at me.

"If there wasn't so much to do right now, I'd stay and we could make love," he says.

"I understand why you have to go," I say. "Will you come home for lunch?"

"Of course," he says. "I think I'll go to the Pit and get us pizza. Does that sound good?"

"Mm-hm. Maybe some cheesecake, too. The chocolate, peanut butter, and pretzel one."

"Alright. Pizza and cheesecake. Anything else?" Just you.

"No," I say. "I'm good." Tobias leaves me alone but returns a couple minutes later with the remaining Candor transfer files from the past five years. I know that I have to reassemble the files I destroyed earlier so I go upstairs and after piling the pillows just so, I climb up on the bed and lean against the padded headboard. It takes me the rest of the morning to get the files back to what they were before I dropped them. I set them to the side and before I start going through the files Tobias brought me, I decide to get something to drink. I carefully make my way to the kitchen and fill a tall glass of ice half way with unsweetened black tea then top it off with lemonade. When I hear a key in the door, my heart leaps into my throat but when I see Tobias, I feel foolish.

"What are you doing up, love?" he asks as he sets the pizza box he's holding on the island. He kisses my cheek as he passes me to put the cheesecake in the refrigerator.

I hold up my glass and say, "I was thirsty."

"Sit. I'll bring you a slice."

"Two please," I say as I lower myself onto the end of the couch. I put my feet up on the ottoman and say, "Peanut's really hungry today."

"Is Peanut the only one?" he asks with a chuckle. He kisses my head then hands me a plate with two large slices of pepperoni. "I'll be right back."

"Have you learned anything?" I ask when he comes out of the bathroom.

"Nothing new I'm afraid," he says. "I told Zeke and Will about what Zander found. I still have to tell Tori but I haven't seen her since she left. I knocked on Harrison's office door but there was no answer. I hope she's okay. His death is tragic but it's making her a bit … crazy."

"I'm glad I'm not the only one who thinks so," I say. "This pizza is wonderful, by the way. Thanks for getting it."

"Have you found anything in the new files?" he asks.

"I haven't gotten to them yet," I say. "The files I dropped were worse than I thought. Has Zeke pulled the security cam footage from our hallway?"

"Yeah," he says. "I'm going to have him upload it to a removable drive so you can go through it from here. I'll bring it home tonight. How are you feeling?"

"On edge," I say. "What if we can't figure this out?"

"Whoever is doing this is going to make a mistake sooner or later, and we'll get them," he says. "Then our lives will go back to normal." I set my empty plate on the end table then snuggle up against his side. He puts his arm around me and kisses my temple. "Are you okay?"

"I'll be fine," I say. "I think I'll take a quick nap after Isobel or Marlene stops by. Then I'll start on the files. Is there anything in particular I'm looking for?"

"A connection to Peter, Drew, Molly, or Sam," he says.

"Do you think she was targeted or in the wrong place at the wrong time?" I ask.

"I don't know," he says. "Does it matter?"

"If we could answer that question, it might tell us which direction to look."

"Good point," he says. "Let's talk about something else."

"Like what?" I say.

"Us," he says.

"What about us?" I ask as I draw little hearts on his upper thigh. "Have you changed your mind about taking me to bed?"

"Unfortunately not. We need a date," he says. "Just you and me, Saturday night. We'll get dressed up. Maybe we'll go dancing or have a picnic. What do you say?"

"A date, Mr. Eaton?" I ask. "That sounds wonderful but should we? There's so much going on right now."

"Forget about all that," he says. "We need to concentrate on us."

"Okay," I say. "How about we see if Mom and Dad want to watch the kids. The other day, Tyler asked when he would get to stay with Grandma and Grandpa again."

"That sounds like a wonderful idea," he says. "I'll set everything up. You don't worry about a thing." A brilliant smile transforms his face, and I feel like I'm staring into my very own private sun. "I know exactly what we're going to do. I should get back to the control room. The sooner I'm home for the day the sooner we can do this." He puts his finger on my chin and tilts my head back. He presses his soft, warm lips to mine and kisses me gently. My heart hitches in my chest when he slowly runs his tongue along my bottom lip. I instinctively open my mouth for him, and he slips his tongue between my parted lips then thoroughly mates it with mine. We break away from each other, panting heavily. He glides his hand down my cheek, into my hair and is moving his mouth back to mine when a knock on the door interrupts us. He growls at the interruption then gets up. "Damn interruption," he mutters. I can't help but agree.

"Hi, Isobel," I say when she walks into the room.

"I better go," Tobias gruffly says. "I'll get the kids from Zander and Stella's before I come home. I love you. Nice seeing you, Isobel."

"You too, Four," she says. Tobias gives me a warm smile and a wink when she turns her back to him and my tummy muscles tighten. How does he do that with just a look?

"Bye. Love you, too," I say then he walks out the door.

"Did I interrupt something?" she asks.

"No," I sigh. "He needed to get back to work anyway. There's a lot going on around here."

"I heard about Harrison," she says. "I'm sorry. Let's check your blood pressure then I'll get out of your hair. Is the baby moving around?"

"Yes," I say, automatically moving my free hand to my tummy. I rub it gently and can feel her moving from both the inside and the out. It's surreal. "She's stretching up a storm right now. Her new thing is lying directly on my bladder. I swear I have to pee constantly." We are both quiet while she listens for my blood pressure through the stethoscope.

"Not bad; although it could be better," she says. "Can I make a suggestion?"

"Of course," I say.

"Get as much rest as you can. I'm not unsympathetic to Dauntless' plight but you don't want to go into early labor."

"Is that a possibility?" She has me worried.

"It could happen. I'm not saying it will though. I just want you and your baby to be healthy."

"I appreciate all you do," I say. "How are you feeling? You're really starting to show."

"This is nothing," she says, putting her hands on her small bump. "I was nearly twice this big at three months with the boys. I'm actually measuring small for nearly five months."

"I forget what it's like to be small," I say. "I miss being able to see my feet." Hhm. That's a sentence I never thought I would say.

"Tris, you may not think so but you are probably the tiniest pregnant woman I've ever known," she says. I study her face but can't tell if she's serious or not. "You wait until I'm eight months pregnant and you'll know what big is." She looks at the clock and sighs. "I've got to get back to the infirmary."

"One quick question," I say as she gets up. She turns and looks down at me. "Four asked me on a date Saturday night. Will it be a problem for me to go?"

"As long as you take it easy I don't see a problem with it," she says. "Actually getting away from everything for a few hours might help your stress level."

"Thanks, Isobel," I say. I manage to get off the couch on my own and lock the door behind her after she leaves. I put the leftover pizza in the refrigerator, pour myself another drink, and head upstairs. My body is really dragging and needs some rest so I lie down but my mind refuses to be quieted. I squeeze my eyes shut in an effort to block out the noise in my head and finally manage to drift off.