Windward Shore by Sharon Hinck

Book 3 of The Dancing Realms

Summary: 

The island world of Meriel faces an old adversary and a new danger. Will the reformed Order die before it has a chance to blossom?

Storm clouds loom on the horizon as Carya and Brantley struggle to overcome wounds of the past and build a future together. The fragile new Order is on shaky ground, with too few dancers and sparse resources. Then trouble erupts—and now an insidious rebellion and a new foe threaten their entire world.

When she uncovers an old enemy behind all the destruction, Carya realizes the past is not done with her. With conflict tearing apart the dancers and villages, rimmers are soon overrun, and Carya must unite her people by leading the battle to protect the very heart of her world … or lose it all.

Opening Lines: 

Where could he be? I squinted toward the horizon, where stormy sky met turbulent sea. Brantley had planned to be back by midday, but the primary sun was already lowering beyond the churning waves. not a good sing. Wind howled from the ocean, and the ground bobbed. A gust slapped into me, rippling my tunic and forcing me to lean forward to keep my footing. My toes dug into the tangleroot.