Lure Of The Wicked

Description for LURE OF THE WICKED by Karina Cooper:

Naomi West was plucked from one prison and placed undercover in another: the gilded cage that is Timeless, New Seattle's premier spa and resort, where owner Phinneas Clarke -- the most seductive man Naomi has ever met -- may be hiding a killer. She's an agent of the Holy Order, trained to hunt the guilty and render justice. But while she's tracking down a rogue agent on a killing spree, Phin is determined to uncover her most damning -- and dangerous -- secrets. Whatever the cost.

This is #2 in A Dark Mission Novel.