In Starcross, Art, Myrtle, and their mother are invited for what seems like the perfect holiday to a new asteroid resort in the Belt near Mars. However, the adventure doesn’t go as peacefully as expected. The family’s getaway turns into something far more dangerous and bizarre involving spies, time travel mishaps, curious hats, and mysterious enemies. Myrtle must use her wits (and her telescope!) to unravel the conspiracy, save her family, and prevent galactic trouble.