Angel's Flight by Ella Summers — book slip

The original Immortals, masters of magic, once reigned over every world in the known universe—until they suddenly vanished. Now, gods and demons fight over the remains of their fractured empire.

New angel Leda, a soldier in the gods' army, is recuperating from her transformation when a curse strikes New York City, targeting the Legion of Angels.

As the Legion's soldiers succumb to wrath, jealousy, and fear, Leda and her archangel lover Nero investigate these phenomena, uncovering an ancient secret that destroyed the Immortals and now threatens to tear the Earth apart.