Devil's Due — Rachel Caine

The money Lucia and her new partner received to open their detective agency had come with strings: any assignment delivered via red envelope had to be top priority. No sweat. No one could make Lucia do something she didn't believe in -- right?

Wrong. Lucia soon learned that every choice she made meant life or death for innocent people. No one could be trusted, not even the ex-cop she'd hired -- and fallen for. In fact, Ben might be her fatal weakness, if the powers warring to control the future used him to control Lucia....