The Same Breath. The Lamb and the Lion, #1

Teancum Leon, who goes by Tean, is a wildlife veterinarian. His life has settled into a holding pattern: he loves his job, he hates first dates, and he only occasionally has to deal with his neighbor Mrs. Wish's cat-related disasters. All of that changes, though, when a man appears in his office, asking for help to find his brother. Jem is convinced that something bad has happened to Benny, and he thinks Tean might be able to help.
Tean isn't sure, but he's willing to try. After all, Jem is charming and sweet and surprisingly vulnerable. Oh. And hot. Then things get strange: phone calls with no one on the other end of the line; surveillance footage that shows what might be an abduction; a truck that tries to run Tean and Jem off the road. As Tean and Jem investigate, they realize that Benny might have stumbled onto a conspiracy and that someone is willing to kill to keep the truth from coming out.
But not everything is as it seems, and Tean suspects that Jem has been keeping secrets of his own.