FBI counter-terrorism unit chief John O'Neill invites Muslim-American rookie agent Ali Soufan onto his squad. They soon realise that their work has just begun beginning when two American embassies are bombed.

Following the simultaneous embassy bombings in Kenya and Tanzania, the FBI begins a ground investigation while the CIA starts work on a retaliation plan.

The FBI finds one of the surviving terrorists and discovers a game-changing lead in Nairobi, and the CIA's retaliation plan is approved.

Continuing to keep information from the FBI, Schmidt is fired from Alec Station; Diane makes an important discovery about the owner of the phone number Owhali gave Chensey; O'Neill searches for solace in his faith.

The CIA and FBI are on high alert as threats surrounding the new millennium abound; O'Neill and Soufan raid an AQ cell in Brooklyn; the CIA continues to hide vital information from the FBI while they track suspicious individuals entering the US.

Vince continues asking for permission to share Mihdhar's visa with the FBI; O'Neill loses his briefcase and an investigation into his handling of classified materials begins; a radicalised boy goes to Yemen to start his own martyrdom journey.