Lost on Aquaria (Zenda #4)

Zenda's school is taking a weekend trip to Aquaria, one of Azureblue's watery moons. Everyone else is excited about the trip, but Zenda can't shake the terrible feeling that something bad is going to happen. Sure enough, Zenda finds herself separated from the group with her nemesis, Alexandra. The two girls must put aside their differences to brave the dangers of Aquaria-as well as escape from the mysterious monster born of their own doubt and fear. Besides finding her musings, Zenda must also find her way home-but first, she must confront her fears.