I just finished reading the teen book, Guardian of the Gate by Michelle Zink, which is the sequel to Prophecy of the Sisters, about twin sisters in an ancient prophecy where one is the guardian and one the gate. If you haven't read the first book...this review might ruin some of the suspense of the first book. 

Lia, who is determined to save the world from the unleashing of "the Souls," is trying to find a way to end the prophecy, while her twin, Alice, wants to see the evil prophecy fulfilled.

The sequel keeps the suspense going, and introduces a new character Dimitri, which also introduces a romantic "Twilight-like" feel to the story. I actually found the "romancy" scenes distracting from the action, but some readers might see it as a plus. The ending wraps up the current book, but also leaves enough unresolved to guarantee a sequel.

While Libba Bray's A Great and Terrible Beauty series is a higher on my own personal list of recommendations, I think that fans of Bray's books (as well as those looking for some of the same kind of suspense and romance of Twilight) would enjoy this series.