Demons & Darkness by Luka Fallon

Vince James revels in Damien Blake’s romantic side. Adventuring through Europe and being drawn further into Damien’s circle is almost everything he’d ever wanted.
Damien Blake doesn’t trust easily. When he begins to suspect that a childhood friend is keeping dangerous secrets about what happens after dark, Damien vows to do everything in his power to end the terror in the “cursed” French village.
Vince and Damien travel to Gevaudan in France, where history’s most famous werewolf legend was born. Damien’s childhood friend is in trouble, Lawrence has been attacked by a wolf and his family business is from going under. With time running out, Damien and Vince consistently butt heads as they both race to learn the truth about the Beast of Gevaudan.

Will Vince solve the mystery in time to save Damien’s friend and destroy Damien’s doubts about their relationship?