Season 4

When a would-be terrorist attempts to set off a bomb in Times Square, the FBI embarks on a high-speed, high-stakes race against time to catch the bomber.

Following the murder of a Deputy Sheriff by a Latino gang, the FBI leads a task force in Operation Knockout, the largest anti-gang operation in US history.

Following the fatal shooting of a U.S. Deputy Marshal during a stakeout of a wanted fugitive, the FBI's Hostage Rescue Team is called in.

As the FBI prepares for a final assault on the remote cabin where fugitive Randy Weaver is holed up, a gruesome discovery puts the entire mission on hold.

An FBI investigative specialist with no undercover training goes undercover and comes face-to-face with Robert Hanssen, a suspected spy.

Eric O'Neill, an FBI investigative specialist with no undercover training, manages to win the trust of suspected spy, Robert Hanssen — or so he thinks.

In 2011, 14-year old Chyenne Kircher disappears from her dysfunctional small-town Illinois home, leaving a convincing runaway note.

The FBI doggedly wade through their prime suspect's emotional outbursts, half-truths and outright lies to find out what happened to Chyenne Kircher.

A pipe bomb at a concert is the first of a string of explosions during the 1996 Atlanta Olympics; the FBI have a serial bomber on their hands.

After another deadly bombing, a suspicious character in a wig is seen walking away, sparking one of the biggest manhunts in U.S. history.

After a tip from an informant, FBI agents work to track down priceless works of art stolen from Denmark’s national museum.

In 2015, the FBI uncovered a deep and widespread criminal conspiracy among members of FIFA - including wire fraud, racketeering, and money laundering.

When a massive bomb planted in a van explodes below the North Tower of the World Trade Center in 1993, the FBI sets out to find the bomber

After a family doctor well-known for performing abortions is gunned down in his suburban Buffalo home in 1998, all clues point to an anti-abortion extremist as the sniper.

In 2014, a suburban police detective learns of a Seattle filmmaker who convinces teenage girls to engage in prostitution with fraudulent promises that they'll cash in when he makes a movie on the subject.

When the CIA's most valuable Russian assets start disappearing one by one, the Agency starts hunting for the mole who's been betraying them since 1985.

After the 1963 bombing of a Baptist Church in Birmingham takes the lives of four young girls, the FBI embarks on a four-decades-long quest for justice.

FBI agents uncover new evidence from the Birmingham Church Bombing that could finally bring justice to the young girls killed in this act of racial hatred.