All the secrets of Season 4 are answered in the thrilling fifth season of NCIS as Special Agent Tony DiNozzo's involvement with the daughter of an arms dealer reaches its explosive conclusion. DiNozzo isn't the only member of the team who will be forced to reveal long-held secrets, as both Director Jenny Shepard and Doctor "Ducky" Mallard face investigations that could ultimately destroy their careers. As for Special Agent Leroy Jethro Gibbs, the fifth season will begin with a heartbreaking journey that will lead to redemption and end in murder.