The Gate to Oblivion — Matthew S. Cox

Brooklyn Amari doesn't ask for much, only the ability to make it through life without destroying the universe.Working as a firefighter is her true calling, satisfying her deep, primal draw to the flames. Immunity to burning courtesy of her half-extraplanar ancestry makes her the city's best weapon against disaster of the incendiary kind -- not that anyone knows about it. She's trying to keep her nature a secret, since magical creatures aren't allowed inside major population centers… and most people probably wouldn't react well to a demon.Even a half-demon.Since her psychic abilities are out of the bag, the Arson Investigation Unit calls on her for all the ‘weird ones' no one else wants to touch. When they can't explain an apparent case of spontaneous human combustion, they bring her in to track a deadly arcane arsonist.She's happy to help, but unfortunately, some not-quite-angels abduct someone she cares for. They need Brooklyn to destroy the mortal world as it's in the way of their interdimensional war -- but even if she does what they want, everyone she loves will die.