Into the Black (Beyond the Red 2)

The world ruler is dead, technology foundational to their society has been destroyed, and Safara is on the brink of collapse. Half-human, half-alien Eros is the rightful heir to the world throne, but before he can return to the capital, he’s abducted by a rebel group of humans who call themselves The Remnant—and they won’t release him until he swears to help them overthrow the very government he’s inheriting.
With Eros missing, ex-queen Kora is determined to stave off mad grabs for the throne. But as royalty from across the territories flock to the capital, and a new charismatic candidate takes the spotlight, Kora sets off into the desert with a skilled prince-turned-bounty hunter to find Eros before it’s too late for both the future king and his kingdom.
Finding Eros is only half the problem, though; if they can return to the capital, he’ll need to be ready to prove he’s worthy of the throne to the high council, to the Sepharon and human people, and, most importantly, to himself.