Rescue the Nightingale

At the onset of the war, a humanitarian aid worker suddenly goes missing in Ukraine. Connor, a former Navy SEAL and ex-CIA operative, had long left behind his life of violence, but to save her, he steps back into this shattered land. Alone, he crosses the war-torn front lines, facing mercenaries at every turn, with the ever-shifting battlefront threatening to swallow him whole. Even more daunting are the shadows of his past he thought he'd left behind. Amid the ruins of a devastated city, he must find the missing woman in the crossfire of multiple factions, and in the hail of bullets, settle scores with his own history.