The team attempts to rescue a kidnapped girl, but their involvement in the case brings up personal and moral issues for for Liz, Amita and Charlie when they begin to suspect she might be one of the first human clones.
To find the person behind a deadly gambling ring that is running a high-stakes Russian roulette tournament, Don and his team are called in to investigate. Elsewhere, Don and Charlie become concerned over the financial health of Alan.
Don's team is called in to investigate when several FBI agents are killed in a firefight with bank robbers. Meanwhile, Larry makes a decision that worries Charlie and Amita.
Don and his team are out to protect former radical Benjamin Polk from a determined sniper who wants him dead, and who is leading the FBI on a cat-and-mouse chase as he closes in on his prey.
When Amita is abducted by the leader of a cult, it will take Don, Charlie, the whole team, and even some outside in the form of Ian Edgerton to get her home safely.
The team investigates a series of bank robberies committed by copy cats and find themselves facing a familiar foe.
Still reeling from Don's brush with death, Charlie aims to redeem himself by tracking down a serial killer.
There are dire consequences when Charlie messes up some calculations during a case and his brother is injured due to Charlie's mistake.
The investigation into a professor's death takes a dangerous turn when the team finds their lead suspect has ties to a radical animal rights group.