What is the real story behind the group that U.S. intelligence called "the most dangerous terrorist cell in America?" FRONTLINE and The New York Times join forces to investigate the battle against terrorism here at home in "Chasing the Sleeper Cell." The one-hour documentary is the first in-depth examination of a major, ongoing domestic terrorism case involving Al Qaeda operatives and American citizens they trained. Questions are also raised about the effectiveness of the FBI and the CIA and whether or not the new tools they have are the right ones to contain the threat at home.