Defiance - The Revelations Series, #2

In the past year, Jenna Connors has discovered she's a Nephilim, been pursued by angels and demons, and faced a devastating betrayal that left her no choice but to agree to the angel's ultimatum in order to save someone she loved. Just when life is getting back to normal, Jenna discovers a shocking secret that threatens to destroy her world once again. Defying the angels to keep them safe, Jenna is thrust into her worst nightmare.