The Spark & the Star (en Inglés) - Tess Hunter

The Imperator. During the Luncycle, alkhemy reigns supreme. But every quarter-century, the miracles brewed from the blood of alkhemists vanish. None benefit more from the upheaval than the cruel Imperator. 

The Alkhemist. An ambitious girl who will do anything to save herself from an illness only the Philosopher's Stone can cure. Unfortunately, the one Stone known to exist belongs to the Imperator.

The Boy King. A young man raised on the memory of his family's slaughter. Desperate for revenge, he intends to overthrow the Imperator and reclaim his throne. 

The Prophetic Sister. An idealist who only wants to keep her family safe, she and her sister join the boy's revolution in pursuit of the Stone, risking their lives - and hearts - in the process.

A story that subverts tropes and bridges the gap between Epic Fantasy and Romantasy. The Spark & the Star is ideal for readers who were obsessed with Little Women, Anastasia, and Swan Princess as children, but enjoy the twists and turns and occasional brutality of Game of Thrones as adults.