The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.
Castle takes on Detective Ethan Slaughter (Adam Baldwin) as his partner when tension between himself and Beckett rises, and he sees a new side to police work that puts him in danger.
Dewey's ruthless cousin descends upon Harlan; Raylan tries to undo a young friend's unfortunate mess; Boyd struggles to free Ava from jail.
