Spaced Out by Stuart Gibbs

This book is about a boy named Dashiell, who learns that the base commander, Nina, disappears. The Moon Base Alpha is only so small, concluding to the fact that there is really nowhere to hide. Dashiell goes on another mystery to figure out where Nina is and uses all the clues he has, such as how Dashiell's little sister, Violet, hears something from underneath the bathrooms. Read to find out more!