The show begins with the revelation that newly released prisoner Darwyn Al-Sayeed is actually an undercover FBI agent and practicing Muslim, recruited to infiltrate a sleeper cell of Islamic radical extremists led by Farik, the mastermind of a Jihadist plot to detonate a chemical bomb in a crowded Los Angeles sports arena. Representing a broad spectrum of anti-American sentiments, Farik?s band of holy warriors includes a hot-tempered Frenchman (Alex Nesic), a Bosnian chemist (Henri Lubatti), and a young, Berkeley-born American (Blake Shields) with a post-military beef against the U.S. government. While clandestinely reporting to his FBI handler (James LeGros), Darwyn is forced into deadly circumstances that continuously threaten to blow his cover and get him killed. His ill-advised romance with a single mother (Melissa Sagemiller) poses further threat to the integrity of his investigation, which ultimately involves everyone from local LAPD detectives to the senior staff of the White House??.