His Gold Assassin

The ones with gold skin cultivated the most desired assassins. They had no names. They were only known by a number.
Raised as just another piece in the infamous golden empire's army, Eight has never experienced life outside of keeping to the shadows and carrying out her orders with nothing less than perfection. Except when a mission is actually a trap set by an unknown threat, Eight and two fellow spies are taken as prisoners to a planet that they recently thought deserted. Yet the planet hosts an empire hidden and cloaked from the galaxy with power and technology that Eight's planet would be desperate to get to. Now not only must Eight and her two fellow spies find a way off of the foreign and dangerous planet, but she also must survive the king, the Astrapi, who seems to have his mind set on keeping Eight as his prisoner for the rest of her short life.

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This book is a sci-fi romance