The Glass Grave Prince by Jess Rae

She was sent to sing the dead prince to rest.

Instead, he opened his eyes beneath the glass.

Aria Morren has always known the dead could speak. As a grave-singer from Thornmere, her duty is simple: quiet restless spirits, keep old songs buried, and never ask why her grandmother hid so many truths from her.

Then she is summoned to Eirwyn Palace to sing over the glass tomb of Prince Dain Veyr.

But Dain is not dead.

He was buried alive.

Cursed, betrayed, and bound to a darkness older than the crown, Dain wakes with shadows in his blood and vengeance in his heart. Aria should fear him. Instead, she becomes the only thing keeping him tethered to life.