Deliver Us From Evil — T.M. Simmons

Eartha loves her twin brother, Durand, with all her being. He's been her everything since their parents were killed eleven years ago in a steam-car crash she and her twin survived. She and Durand escaped only by the grace of fortune, and though it's been a struggle, her brother assures her as they approach their twenty-first birthday, their life will soon be easier. What he doesn't tell her is that his pact with evil assures Eartha won't be around to share their more affluent life with him.
Eartha will do anything for her brother … except be his sacrifice.