 Meeting this hopeful member, Jim Horn (Morrison), Black is drawn to investigate a serial killer operating in the area; while Horn begins to unravel under the strain of the case.Several of the cast and crew made their first contributions to the series in "Dead Letters", with Wright, Morgan, Wong and Ellis all returning for future episodes.Production of "Dead Letters" impressed other series regulars—series writer Chip Johannessen praised the script's attention to detail, while producer John Peter Kousaskis called positive attention to its physical and make-up effects.