Chrono X Angel, Book 4: Isolated Waters

After the expedition to Kaiju Island, Usoko must now go on yet another trip after learning that her mother is indeed still alive. Accompanied by an unlikely ally, Usoko must set out to New Atlantis to learn a specific spell that is required to wake her mother from a deep slumber. Rei reconciles and reunites with an old flame, while Emiko must face the consequences of a past transgression that has returned from the dead with a vengeance. Can Usoko get along with her former foe and new companion Elizabeth, as well as learn the spell to resurrect her mother, or will a hidden threat that is creeping ever closer cause tragedy and despair to sprout?