Angus. La Patron Series

Several years ago, Angus Blackwolf appeared at the site of a lab Silas, La Patron, was taking down. At the time Silas had no idea of the identity of the wolf watching from the shadows. That was then, fast forward several years later, as Beta to La Patron, Angus' commitment to his Alpha is absolute. So when he is sent out of the country with instructions to tell no one, not even Silas, Angus balks.
It's only when he learns the fate of his mate is in his hands that he abides by the rules and walks away from everything he's come to love.