Books in the Seraphim series

When tasked with saving a self-loathing human, a fallen angel soon finds herself facing down the devil himself to save God, Heaven, and Earth-even if she has to go to Hell to do it.

While a fallen angel languishes in Hell, the Devil-who loves her-is trapped on Earth and has no choice but to muster an army to save her, but as good battles evil, who is to say which side is which?