Devil's bargain - Rachel Caine

"Playing by the psychic underworld's rules has a cost Jazz Callender's whole life just got turned upside down.

Her friend Ben's been convicted of a crime he didn't commit and Jazz is determined to clear his name, even if it means enlisting the help of dark forces. Enter James, a stranger with a mysterious offer. If Jazz pledges to work for The Cross Society, a shadowy secret organisation, he'll help her save Ben.

But as she's thrust into a world of psychic powers and dangerous magic, Jazz isn't just bargaining for her friend's freedom. She's bargaining for her soul too. And how high a price is she willing to pay?"