ZACA (Zack Tolliver, FBI Book 3)
And again, the chef’s kiss is the description:
A farm worker disappears, another takes his place, the numbers stay the same but Rancher Rufus Reyes isn’t fooled. His operation is small and he knows everyone. Then a worker disappears and no one replaces him. The man’s wife is hysterical, but won’t talk about it. Reyes knows he needs help, He enlists Zack Tolliver.