Louis' and Rebecca's lives hang in the balance. Meanwhile, Dorn tries to take down Dimitrov.

Genovese returns to New York and becomes involved with human trafficking.

The team hunts a sniper who is randomly killing innocent people.

A string of teen suicides that may be linked to Internet bullying are investigated.

A German biker gang embarks on a home-invasion spree. Meanwhile, Sebastian goes undercover for the first time.

As Genovese awaits trial, he offers the ICC an attractive bargain.

The team goes after a gang of black widows who seduce wealthy men into marriage and then poison them.

A string of deaths are traced to toxic cocaine in London.

The ICC tries to protect a movie star after a string of murders involving a film director, agent and journalist take place.

The disappearances of several backpackers may be linked to a serial killer.

The gang escalates their deadly rampage. Meanwhile, the team deals with tragedy and deception.

The gang escalates their deadly rampage. Meanwhile, the team deals with tragedy and deception.