The Hounds of Devotion by Eva Chase

At long last, I’m free from the contract that promised my soul to the shrouded folk. Now I can get to work destroying every bit of influence the demonic fiends have in our world. As an added bonus, I’ve found myself with three unexpected allies who’ll help with that mission.
It’s certainly enjoyable having Sherlock, John, and Garrett around and on my side—both for strategizing and for other, more intimate pastimes. I can’t say I’m entirely at ease with our new friendly arrangement, though. Will they run when they discover just how brutal I can be? Will my growing affection for them dull the sharp edges I need if I’m going to see this mission through?
But when the shrouded folk discover to my intentions, I may regret this alliance even more. The fiends aim to disrupt our plans by any means necessary, and that includes targeting the men I’m no longer sure I can stand to lose.