The Wyvern's Cry. The Inkweaver Archive, #3

Hunted by darkness. Haunted by loss. Forged in defiance. Three years have passed since the horrific night when Arya Ravenstrike barely escaped with her life after the Nightstalker's nazal murdered those she loved. Now on the run, she lives in the shadows, harbouring a secret that could unravel everything if the Nightstalker discovered it. But she can't run forever. Growing increasingly impatient, the Nightstalker will stop at nothing to annihilate Arya and her Sky Lords, even if it means invading her homeland, Dunidaen.
Forced out of hiding to face the looming threat to her family, Arya is not the general she once was. Trapped by indecision and guilt, she struggles see a clear path forward. To save those she loves, Arya must assume the mantle of the Stormrider heir and learn to become a Sky Lord powerful enough to bring down the Nightstalker. Or all will be lost.