In this New York Times bestselling novel the moon base commander has gone missing and Dash Gibson is on the case. The second mind-boggling mystery of the Moon Base Alpha series from beloved author Stuart Gibbs. There's nowhere to hide on the world's first moon base. After all, it's only the size of a soccer field. So when Nina Stack, the commander of Moon Base Alpha, mysteriously vanishes, the Moonies are at a total loss. Though...