The End of Magic — Amber Benson

In the third in the series from the author of the Calliope Reaper-Jones novels, magic has been loosed upon the world -- and the consequences could destroy all of humanity, magical and non-magical alike...

Lyse MacAllister used to be like everyone else -- blissfully ignorant of magic, of the dire battles being fought in shadows and secrecy. But that was before her great-aunt Eleanora died, leaving her in control of the Echo Park coven; before she found herself in the middle of the witches' clash with the anti-magic zealots known as The Flood; before her blood sisters lost their faith in her.

As The Flood begins turning humans across the globe against the witches, Lyse must find a way to regain the trust of her former magical family and once again unify them. Because the final battle between good and evil is looming -- and if the witches don't stand together, all of humankind could be lost...