Devil in the Details by Chani Lynn Feener

What happens when you don’t recognize the monsters in your bed?
Gael Thiago hates his job.
More than that, he hates how confused he’s gotten. The past year has been one of the most complicated of his life, and he’s been left feeling adrift in more ways than one. He decides to try and fix this by signing up for some deviant play at the exclusive Moonward Manor, a club that caters to the dark and twisted. After, he thinks maybe he’s finally found a reprieve from the loneliness in Kai, the man assigned to be his bedpartner, but when there’s a contract involved and the relationship is based strictly on sex, is it all right to get attached? When Gael gets invited to a murder mystery event and goes, hoping to run into Kai, what he ends up stepping into is the playground of a very real killer. One who’s secretly set their sights on him.
Kai Laurier isn’t what he seems.
But then, no one ever is. He’s lived and worked at Moonward Manor since its opening, but he’s never been drawn to anyone the way he is to Detective Gael Thiago. If only Gael wasn’t so sad all the time, if he opened up and trusted his instincts, the two of them could live in eternal bliss. The detective has never said he wanted anything more than the contract between them, but Kai is certain he can convince the other man if given the chance. That chance comes when the two meet again at the murder mystery event. Now, he’s got Gael right where he needs him, he just needs to find the best way to help the detective unravel the mystery and see what Kai has always known.
Devils come in many forms.
And they do things for many different reasons. The Devil of Moonward has a plan. He’s set the board and invited all of the important players, with Gael and Kai at the heart of it all. He’ll have them dancing to his tune in no time, confident he can show them his way of thinking is the right one.
The game has begun.
The prize has been decided.
And he has no intention of losing.