Don and his team are summoned to locate the person who released potentially lethal gas in the city's subway system.

A murder investigation at a Los Angeles card club leads the FBI to a complicated card-counting scheme involving college students.

Don and his team investigate a school shooting. He learns two students could have a strong motive, so Charlie uses the school's radio frequency identification system to track the shooters' movements through the school's hallways. When Charlie detects an abnormal pattern, the agents take a look at the evidence and discover a third participant no one had suspected earlier.

Don and the rest of the team find themselves in the midst of a confusing case. The investigation into a missing painting turns grim as a murder plot surfaces. Add Nazis to the mix, and things take an even more interesting turn!

Don and Charlie track a killer who has murdered several sex predators. The predators took advantage of teenage girls they met in chat rooms. Meanwhile, Larry is ready to begin an adventure with NASA.

When Don investigates a series of bombings, he calls in Charlie to help pinpoint the bomber. But the two disagree over who the culprit is. Is it a new terrorist, or an old enemy?

Don, Charlie, and the team attempt to stop a serial killer who is seemingly obsessed with people resembling Biblical figures.

Don and his team hunt for an ex-Marine wanted for murder. Things become confusing, however, when the Marine's family is kidnapped. Is there more to this case than meets the eye?

The team investigates a crew stealing high-end goods from a shipping service; Don questions his faith in the FBI when one of his men is killed on duty.

Don and his team must race to save the hostages being held on a hijacked bus.

Don's life hangs in the balance after he is injured during a raid while investigating a series of home invasions.

Don and his team are called in to investigate who is behind a deadly gambling ring that is running a high-stakes Russian roulette tournament. Also, Don and Charlie become concerned about Alan's financial health.

Charlie and Don reluctantly enlist the help of imprisoned con man John Buckley to help them catch a crook who's using Buckley's M.O. to rob the Diamond Exchange..