The Shadows of Stars by Samantha Amstutz

Fate reunited them—but it may yet tear them apart.

Barely surviving a battle with rogue wraith, Serenna races against time to save Fenn’s life. But he’s slipping away, fading with every heartbeat as he succumbs to grievous wounds.
Just as despair threatens to claim her, Vesryn rips through the veil of distance. Drawn by her presence through the bond, he portals directly into the wraith fortress.
But the stars weave ruthless cruelty and their reunion is fleeting when Lykor appears. The coercion burned into his mind erupts at the sight of Vesryn, demanding the prince’s destruction. Bound by the king’s merciless command, Lykor is powerless, left with no choice but to strike.
Fenn’s life isn’t the only one hanging by a thread—Jassyn lies abandoned, left for dead by Lykor’s hand after their brutal clash in the jungle.
Even if they escape unscathed, their battle is far from over. The remaining Heart of Stars must still be reclaimed, and ancient secrets wait to be unearthed on the other side of the world…