The team members go under cover on a cruise ship in order to locate and disable stolen rockets; as Valentine's Day approaches, Ralph develops a crush.
Lindsay's mother tries to help the Intelligence Unit track a killer, however her motives are quickly thrown into question.
The arrest of a jewel thief leads Peter and Neal toward a much more heinous case of an adoption attorney extorting hundreds of thousands of dollars from his clients.
The nation remains vulnerable, but President Taylor presses on with the peace process. Then, as CTU faces failure, the search begins for someone to blame.
A search for an abducted teenager leads the team to a member of the Witness Protection Program, and a decades-old political extremist group. Hondo and his girlfriend disagree over a guest speaker at her community centre.