The Stars Never Rise - Rachel Vincent

In the rebuilt town of New Temperance, sins are prosecuted as crimes by the brutal Church and its army of black-robed exorcists. When Nina Kane discovers that her sister Melanie is hiding a dangerous secret, she knows she can't protect them both on her own. Wanted by the Church and hunted by mutated monsters, Nina and a band of young fugitives fight to expose a startling truth that will change their world forever.