These Burning Stars

"On a dusty backwater planet, occasional thief Jun Ironway has got her hands on the score of a lifetime: a secret that could raze the Kindom, the ruling power of the galaxy. A star system away, preternaturally stoic Chono and brilliant hothead Esek - the two most brutal clerics of the Kindom - are tasked with hunting Jun down. All tracking all three across the stars is a ghost from their shared past known only as Six. But what Six wants is anyone's guess. It's a game of manipulation and betrayal that could destroy them all. And they have no choice but to see it through."

Synopsis from Open Library.