Demon Evolution — David Estes

Demon Evolution- the second book in the young adult fantasy trilogy: The Evolution Trilogy... Spreading darkness... Guilty of treason for which the penalty is death, Taylor's angel boyfriend, Gabriel, has been captured. The fate of the world sits on a knife's edge, with Taylor being the key to everything. Taylor's aura is growing stronger, but will it be enough to save Gabriel and defeat the Archangel Council.