The Crimson Coven (Sanctuary of Blood) by R.L. Summerfield

Behind sacred walls, evil found sanctuary.

After losing her grandmother, Serena is sent to Saint Brigid's Academy - a secluded church school buried in winter silence. But the girls inside do not pray. They hunt.

Behind locked doors and beneath ancient stone, a crimson coven feeds in the dark. The symbol around Serena's neck may be the only thing standing between her and the grave.

As blood spills and faith is tested, the sanctuary becomes a battlefield.

And when the fire rises, not everyone escapes the flames.