In the series opening, we get to know Caleb Temple losing his sister in an unexpected way, and then his father dying in prison being the prime suspect of his daughter's death. Lucas Buck, the all-around town sheriff steps up for Caleb's adoption, while Caleb runs away from his wannabe adopter. A long lost cousin returns to Trinity to help her kin, and the new town doctor starts to discover that the whole town is in a web with the sheriff in the center.