Snow Moon by Tonya Coffey

Jessa, the queen of the Faeries, finds herself in the midst of disappearances. When she investigates those who have vanished, she discovers a rogue Sylph. He is ridding the realm of the ones he believes are diseased with the help of Trolls.

Together, Micha and Jessa discover their bloodline is more than they thought. They are both descendants of Ancients and Sylphs making them the true Elementals. The very people the Sylph is wanting rid of.

If it wasn't enough, trying to protect her people, and the one she loves, Jessa is forced to let Micha go. She pushes him to go to the Ancients where he will be safe from the Sylph's wrath.

When Jessa is convicted of meddling in the Sylph's business, she is sentenced to death. Micha, accepting his new role as the Ancient king, wields their power and frees Jessa from the clutches of the Executioners.

Will Micha and Jessa save the Elementals, and themselves, or will the Sylph take control of the realms?