Synnr’s Ride by Kate Rudolph

Sparks fly when an alien soldier and an enemy spy must work together to win a war…
Jori Harek is a loyal Synnr soldier.

He’s determined to get to the bottom of Apsyn treachery and root out the rot before the enemies make any more headway onto his home moon. It’s a job he’s proud to do, but when he’s asked to infiltrate a gang of Apsyn sympathizers, his limits are tested.
Hanna Karsyn is a reformed Apsyn spy.
When Hanna finds out just how far her superiors were willing to go to win the war, she walked straight into the arms of the Synnr military… and straight into a holding cell. Her only chance at freedom lies in helping Jori infiltrate a gang and uncover a cell of saboteurs.
Though there’s no time for romance, each moment Jori and Hanna spend together creates an unquenchable blaze between them – one neither can deny, even as their passion puts both of their futures at risk.