Space Case by Stuart Gibbs

this. The rocket returns to earth in two days. If we haven’t caught the murderer by then, you’ll be stuck here with whoever it is for another month. Or more, if the next rocket is delayed.”
    I hadn’t thought of that. “Is there even any way to lock someone up here?”
    â€œNot that I’m aware of.” Zan sighed. “I don’t think it ever occurred to anyone. I suppose there’s a way to barricade someone in their room, but you’d have to let them out anytime they needed the bathroom. On the whole it’d be much better if I could escort our killer back to earth.”
    â€œBut if you’re not supposed to investigate, won’t NASA flip when you suddenly arrest one of the Moonies?”
    â€œIf and when we have proof, I think they’ll change their tune—no matter how bad the PR is.” Zan glanced at her watch and stood. “Sorry, but I’ve spent too much time here as it is. People are going to start wondering where I am.”
    I got to my feet and met her by the door. “Thanks,” I said.
    â€œFor what?”
    â€œWanting to find out what happened to Dr. Holtz.”
    â€œI should be thanking you for that.” Zan reached for thedoor, then seemed to think of something and turned back to face me. “I hate that I have to say this, but for your safety we need to keep our alliance a secret. You can’t let anyone know we’re working together—or that I’ve even come to you. In fact, it’s probably best if you don’t even let on that we’ve met at all. Don’t mention my name to anyone. If anyone asks you about me, say you haven’t met me yet.”
    â€œEven my parents?”
    â€œEven your parents. This is a very small community, and gossip will travel through it quickly. If there is a murderer, I don’t want them having any idea you’re involved in this. To that end, don’t come to me with anything. I’ll come to you.”
    â€œBut what if I find something important?” I asked.
    â€œI’ll be keeping a close eye on you,” Zan told me. “It won’t be hard to do in quarters as tight as this. Though be aware, our target will be able to keep a close eye on everyone as well. Both of us need to exercise extreme caution. Speaking of which, no one should see me leaving your room.”
    â€œRight.” I opened the door and checked the catwalk. No one was outside. “Coast is clear.”
    â€œI’ll be in touch.” Zan gave me a wink, then slipped out and quickly ducked around the corner.
    I closed the door behind her, wondering what I’d gotten myself into.

Excerpt from The Official Residents’ Guide to Moon Base Alpha , © 2040 by National Aeronautics and Space Administration:
    VISITORS
    As a lunarnaut, you are probably aware that there will occasionally be visitors at Moon Base Alpha. In fact, there would be no MBA without the funds provided by space tourism! I Be aware, our visitors’ commitment to MBA is just as strong as yours. So don’t think of them as tourists; consider them investors in the international space program. And though our guests are not official employees of NASA or their families, remember: They still have undergone a rigorous selection process and extensive training for their visit, just like you.
    The visitors have strict instructions not to get involved in—or interfere with—the day-to-day workings of MBA. It is requested that all lunarnauts return the favor and provide our guests with the highest-quality lunar experience possible. To that end, please do not:
    â€¢Â Bother, harass or pester the visitors in any way
    â€¢Â Ask the visitors for money or employment after your stint at MBA ends
    â€¢Â Enter the visitors’ quarters without their express permission
    â€¢Â Spread gossip, rumors, or idle hearsay about the visitors
    Thank you for your cooperation!
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    I . Currently,