Guardian of the Gate (Prophecy of the Sisters, Book 2)

In this highly-anticipated sequel to Prophecy of the Sisters, sixteen year-old orphan Lia Milthorpe continues her quest to end an ancient prophecy that has turned generations of sisters against each other. Having now accepted the responsibilities tied to her role as Gate, Lia journeys to the unchartered isle of Altus to continue her search for the missing pages of the Book of Chaos--the pages that could tell her how to end the prophecy once and for all. Along the way, her courage, strength, and soul are tested in ways she never could have imagined.
Meanwhile, twin sister Alice continues to hone her spellcasting abilities, completely ignoring the rules that govern the Otherworlds. Alice will stop at nothing to reclaim Lia's role of Gate, and that's not the only thing she wants. There's also Lia's true love, James.
The outcome of this battle between sisters will have consequences of Biblical proportion. In the end, only one sister will be left standing.