Cary's Beltane Night Out. Cary Redmond Short Stories, #19

Beltane, bonfires, magic.and human sacrifice? When Cary Redmond ends up at a Beltane celebration with her best friend, the witch Angie Jordan, Cary knows she's in for an interesting night. Trouble swirls in the air right alongside the campfire smell. Magic and danger and people to protect. All in a night's work for a magical Protector and her powerful best friend. But Cary gets a lot more than she bargains for. A field full of bespelled pagans trying to throw themselves into a giant bonfire only starts a night of deadly danger.
Because inside that fire, the real threat lurks. A threat impossible to destroy. And if Cary can't figure out what's going on in time, a lot of people will burn.