After a bomb leaves three people dead, the team presses a reluctant informant to gather information from his close friends who are under suspicion. Also, OA finds tension in his relationship with his girlfriend, Mona, when they clash on where the informant’s rights lie.

The team races to stop an active serial killer after three women are found weighted down at the bottom of a lake, and Jubal looks into an old closed case after there are multiple similarities to the recent victims.

The team welcomes a new member, Special Agent Tiffany Wallace, as they search for killers who orchestrated a mass shooting at a media company, and OA’s personal connection with the case threatens to cloud his judgement.

The FBI team investigates a drug deal gone bad after the body of a college student is found. Also, Detective Hailey Upton temporarily joins the team and finds her usual investigative methods clash with the Bureau's more buttoned-up environment.

Jess LaCroix and his team come to help OA find a fugitive LaCroix arrested years ago after a bus with 26 students goes missing and he's the main suspect. The crossover continues on FBI: Most Wanted S01E09 Reveille (II).

When the team is called to the scene of a murder, they quickly suspect political motivation, but when another murder occurs, they work to uncover a common thread before more bodies pile up. Also, Maggie contemplates a decision that could affect her entire career.

After a key witness and a U.S. marshal are ambushed and killed, Maggie and OA must track down a man who leaked the information that led to their murders.

Maggie and OA lead the search for an abducted former biological weapons chemist.

Maggie and OA hunt down a ruthless group of robbers who are posing as police officers to target armored trucks.

After a senator’s daughter is kidnapped and held for ransom, the FBI is called in to assist with finding the child before their time limit expires. However, in order to do so, they must dig into the senator’s past for clues to who did this to his family.