ou’re not going to believe what I found,” Alex says as he slips into our library cube and slides the soundproof door shut. He’s leaning back, just barely balancing the weight of what looks like six more mega hardcovers to add to the twenty-something that are piled up around me. I want to laugh at his excitement—I love when he does his “I’m determined to solve this” thing. But I don’t laugh, because that’s a lot more reading.

      We decided to hit S&E, the science and engineering library at UCSD, because his aunt works here, which means she’ll let us in and she’ll report back to his mom and tell her that we’re studying. And we are, just not anything school related.

      “Please tell me it’s something productive and not another outdated copy of Maxim? Just because your mom won’t let you read it, doesn’t mean—”

      Alex ignores me and dumps his books onto our table with the rest of them. I try not to be annoyed—though I don’t try too hard. Adding more books to this stack hardly seems to solve our problem. I’ve got everything from the 9/11 Commission Report to a Michael Crichton novel, not that any of it has turned out to be particularly helpful so far. The Crichton novel and a couple of other thrillers are pure fantasy or speculative fiction grounded in paranoia and conspiracy theory. And some of the more scientific bioterrorism books read as a sourcebook or guidebook for how to handle an outbreak. Then there are the true accounts of outbreaks of smallpox in the Soviet Union and Ebola in a Washington, DC, lab.

      In other words, nothing even remotely helps me figure out how my John Doe ended up dead of radiation poisoning while he was driving a truck.

      “You going to tell me what’s so exciting?” I ask. My phone starts vibrating against the table, but I’m not a hundred percent sure where it is under all these freaking books.

      Alex grins before leaning forward and picking up one of the thickest books and thumbing through it. “I was looking through The Handbook of Viral Bioterrorism and Biodefense, and I found this.” He opens the book wide to page 428, where the chapter heading reads “Biological Warfare of the Future: Viral Bioengineering.”

      “Right now bioterrorism is based on bacterial agents,” Alex says. “Category A are the worst, like anthrax—they spread easily and quickly, and could lead to a wide-scale outbreak.”

      “I know that. Everything we’ve read so far says that.”

      “Which is why this book is so cool. It’s speculating what’s next. Viral engineering isn’t that far off. In fact,” he adds, pushing the book toward me, “look right here. It asks whether radiation can be harnessed into a transmissible virus. And it gives a detailed explanation of what geneticists might have to do in order to come up with something that could be engineered.”

      He’s still smiling. Which doesn’t make sense, now that we’ve just proven finding information on how to become a bioterrorist isn’t all that hard.

      But I’ve seen this look before. It’s the same look Struz and my dad get when they’re close to cracking a case, like they’ve discovered the secrets of the universe. It makes me think Alex is doing the right thing by deviating from his mother’s life plan. He doesn’t want Stanford undergrad and Johns Hopkins medical. He wants West Point and the FBI—like my dad. And the thought of Alex actually working for my dad someday makes me smile.

      Then it hits me.

      “Wait a minute,” I say. “Maybe we’re coming at this from the wrong angle. Maybe it doesn’t matter how the virus is being spread—someone from the CDC can figure that out. What’s important is the countdown.”

      I stand up and push in my chair, stretching my legs. My phone vibrates again, and this time I see that it’s Nick. Again.

      “Let’s say, for argument’s sake, someone has managed to engineer a virus. Whether it’s radiation poisoning or not, it’s ugly and it’s going to kill people. So how does picking people off one at a time—what does that have to do with the countdown?”

      Alex gasps and sits up straighter. “That’s how they connect!” He looks at me, and I’m tempted to prompt him to tell me, but I know better than to interrupt his train of thought. “The UIED. It’s not a bomb. J, it’s something that will disperse the virus. Make it airborne or make it catch fire.”

      A shiver moves between my shoulder blades. “But why would terrorists give the FBI a heads-up like that?”

      “Because they’re sociopaths? I don’t know, but it makes sense. If the UIED goes off, the virus goes airborne, maybe it’s some kind of chemical explosion that triggers it. And maybe the FBI got their hands on the UIED earlier than they were supposed to. Or maybe the terrorists want us to know it’s coming. Think of the panic it would incite. And isn’t wrecking our way of life part of the whole terrorism package?”

      My phone buzzes again, and this time I pick it up and toss it carefully from hand to hand. “So with that theory, my John Doe and the other victims, they’re test subjects?”

      Alex shrugs. “Maybe people who pissed off the terrorist group?”

      Somehow I’m not satisfied. This theory doesn’t give me an identity to associate with the guy who died the same day and time that I did on Torrey Pines Road.

      “J?” Alex says.

      “Hmmm?”

      “You think it’s time we tell your dad?”

      I’m about to nod. After all, it’s past time we shared our theories with him. It could be totally off, and it could be something someone already thought of. Or it could be right. Or it could fall somewhere in between. Either way he needs to know. But as I’m about to say that, the door to our room slides open and Nick sticks his head in and says, “Tell her dad what?”

      Inwardly, I groan. I wouldn’t have told him where I was headed after school if I thought he and his other half were going to show up.

      Kevin pops in behind him and pushes the door wider. “You confess your true feelings yet, Trechter?”

      “Kevin, shut up,” I say as I focus on Nick. “What are you doing here?”

      “I’ve been looking for you for, like, an hour,” Nick says. “Why didn’t you answer your phone?”

      I gesture to the books. “I’m working?”

      Nick picks up one of the books closest to him, and I’m tempted to take it away from him, but that’ll just look more suspicious, and I don’t trust him with this.

      “You work too hard, J,” Kevin says. Shocking that he thinks so.

      Nick puts the book down and leans against the door. “I know what the problem is. You need to have fun. Come with me to Hines’s place tonight.”

      “Alex and I are going to finish studying and then . . .”

      Alex knows me well enough to know I’m looking for an excuse, so he jumps in. “We’re going to watch Tron: Legacy.”

      Since this is the Lamest Excuse Ever, there’s no way I can