Blaming himself for Gayle's death and Mina's successful suicide bomb attack, Darwyn embarks on a suicide mission of his own, heading to Yemen to seek out Farik one last time.
As July Fourth dawns, the cell prepares to launch two coordinated dirty bomb attacks on the city of Los Angeles, while Darwyn and the FBI move to shut them down.
Darwyn struggles with having to work for a new boss - the new cell leader - who cuts him out of the loop when planning the cell's upcoming attack.
Believing the nuclear material is about to arrive at the Port of LA, Darwyn alerts the FBI to prep for picking up the nuke and taking down the cell.
In Najran, Saudi Arabia, newly freed Farik uses all his resources to further the nuclear plot against Los Angeles.
The network needs Darwyn to acquire an explosive weapon; Ilija faces a difficult decision; Farik is expatriated to Saudi Arabia.
Darwyn strives to maintain his cover; Farik's interrogators utilize new techniques to get information.
FBI agent Darwyn Al-Sayeed prepares to start a new life, then he must investigate a terror suspect; the CIA interrogates Farik.
When Darwyn discovers that the explosion is a decoy, he leaves a clue he hopes will lead the FBI to the true target.
The cell hijacks a chemical truck; Farik spends the last night with his wife; the FBI prepares to stop the attack; Darwyn discovers that the explosion is a decoy.
The cell buys explosives from a white supremacist militia, while Darwyn's new handler, Patrice Serxner, tries to prevent the LAPD from blowing his cover in another investigation.
When an Afghan boy arrives at the warehouse looking to be trained as a jihadi, Darwyn introduces him to a more moderate brand of Islam in the hope of steering him away from terrorism.
Darwyn befriends a pesticide-plant worker in order to buy some of his company's product under the table for the cell, while each of the jihadis cope with personal troubles of their own.
The cell members pose as Iraqi insurgents in training, in order to infiltrate and take over a secure warehouse as the new base of operations for Youmud Din.
Farik sends biochemical student Eddy Pangetsu on a flight to Vancouver, Canada, to drive a shipment of real anthrax across the Canadian border down to Los Angeles.
Farik learns that the money supply filtering in from Mexico to finance `Youmud Din Judgement Day' has come to a halt; Farik, Darwyn and Christian cross the border to Tijuana, Mexico, and attempt to straighten out their financial problems.
Farik and Ilija receive a deadly biological anthrax shipment and prepare for an attack inside a Los Angeles shopping mall.
Darwyn Al-Sayeed is a Muslim ex-con who has just been released from prison and finds his way to an Islamic extremist named Farik, who recruits him to join a terrorist sleeper cell planning an attack in Los Angeles.