Fall of Angels. Sins of Angels, #5

To fight a war with heaven, make an ally of hell. Rachel Jordan sought to free mankind from the Angels' rule. Instead, she unleashed their final judgment. As the Angels wage war against the civilisations that defied them, Rachel searches for any force capable of standing against heaven itself. Any ally. Any weapon. Any chance. Even if it means turning to the one force every child grows up dreading.
The ancient Adversary nearly destroyed humanity once. But it is also the only force in existence that has ever challenged the Angels-and defeated them. Now Rachel must decide whether humanity's survival is worth making a bargain with its oldest enemy. Because victory may cost more than freedom. It may cost their souls.