Grace and her team investigate the savage slaying of a woman and the abduction of her son. Surfacing as a suspect: the boy's father, whom Grace desperately tracks. Elsewhere, Ham continues to cope with a shattering personal loss.

The squad is hunting down an apparent serial killer. Grace must work with a new partner, Abby Charles, a uniform policewoman and single mother. Elsewhere, Leon's execution date looms large, as the angelic Earl prompts Grace to help the prisoner.