Gaining Ground — Gail R. Delaney

Lilly Quinn thought she lost her husband Jace in the mission that brought Michael Tanner home. The mission that set into motion the revelation of the Areth's true face. She had reconciled herself with raising their baby alone.
But, miracles still happen and somehow Jace is back... at least his body is. His heart, his mind, is still trapped somewhere in the darkness of an Areth prison.
Somehow she has to find a way to awaken his heart again.
All the while the demon Areth breath hot and angry down Phoenix's neck... waiting to wipe them out along with the rest of the human race.