In the wake of the Boston Marathon bombings, Americans are asking why the country’s intelligence agencies failed to prevent the devastating attack. Recent news reports indicate that even though the CIA and FBI had been warned about at least one of the bombing suspects, the two men still managed to elude America’s security net.

Have the hundreds of billions of dollars spent since Sept. 11 on counterterrorism efforts in America made us safer?

In response to the recent terrorist bombings in Boston, FRONTLINE will take a definitive look at that timely, urgent question next Tuesday, April 30, in Top Secret America – 9/11 to the Boston Bombings, an updated version of our film which originally aired in September 2011. Pulitzer Prize-winning reporter Dana Priest traces the journey from 9/11 to the marathon bombings, examines efforts to improve information sharing among federal agencies tasked with keeping us safe and investigates the secret history of the 12-year battle against terrorism.

The program will replace the previously announced Never Forget to Lie, which will now air on Tuesday, May 14. Check your local listings here.