The Morning Star by Debra Dunbar

The final Imp Series novel

Seven Grigori enforcers have been murdered, lured to their death by a demon, and bearing the faint energy signature of a Fallen archangel no one has seen in over two million years. As the Iblis, it’s Sam’s responsibility to find the Ancient responsible and bring him to justice, but how can she manage that when she can’t even keep her adopted infant angel from repeatedly killing his corporeal form?

She’s determined to prove herself worthy of the Iblis title, but when the killer claims to be Samael, and an army of demons along with the most powerful Ancients in Hel flock to his side, what’s an imp to do?

The fate of the human world and the entire angelic host rests in her hands. Can Sam get control of Hel, and more importantly, can she face down the Fallen archangel whose shoes she’s struggling to fill?