With remarkable access to top government officials and counterterrorism investigators-and featuring an exclusive interview with a member of the alleged terrorist cell-"Chasing the Sleeper Cell" takes viewers inside a secret national security investigation to witness how America's intelligence agencies pursued an alleged Al Qaeda cell operating in the United States.

With remarkable access to top government officials and counterterrorism investigators-and featuring an exclusive interview with a member of the alleged terrorist cell-"Chasing the Sleeper Cell" takes viewers inside a secret national security investigation to witness how America's intelligence agencies pursued an alleged Al Qaeda cell operating in the United States.

Thursday, January 29, 9:00 p.m. ET