Mistress of Bones by Maria Z. Medina

An epic, multi-POV debut fantasy perfect for fans of The Bone Shard Daughter and Six of Crows, where a necromancer trying to resurrect her sister gets embroiled in bigger, world-ending plans instead

Necromancer Azul del Arroyo only wants one thing: to steal her sister back from Death by reclaiming her sister’s bones. But the Emissary of the Lord Death will do anything to stop her, no matter how alluring he finds her . . .
As their paths collide, they’re drawn into a deadly game of pawns and power with a count who begrudgingly works for a child king, a faceless witch who transforms the bones of gods into dreams she can peddle, and a long-lost half-brother with a secret of his own—and soon realize the fate of the lands is hanging in the balance.
For long ago the gods raised the continents, binding them with their own bones to keep humanity alive. But in an era when the gods’ sacrifice has been forgotten, Death might not be the only resentful god Azul must defy.

Swashbuckling, grand, and tragically romantic, Mistress of Bones is a can’t-miss start to a duology about love, loss, and, of course, death.