A Rosary of Stones and Thorns — M.C.A. Hogarth

When the angel Asrial discovers that the halos of the Fallen have been maintained in Heaven against their eventual return, she speaks out against Archangel Michael's plan to make war on them on Earth. For her insolence, she is driven from grace and ends up in the parking lot of a Jesuit high school. But can she, a priest, a demon and two high school kids stop the Apocalypse... and redeem the Fallen?