Series premiere: A young boy is held hostage in an underground bunker in rural Alabama. How the FBI got inside the mind of his kidnapper. Narrated by Alana De La Garza of the CBS series "FBI."

Russian spies living as Americans. Could they be your neighbors? How the FBI stopped a potential threat to national security. Narrated by Alana De La Garza of the CBS series "FBI."

A city under siege. A serial bomber at large. How the FBI helped end a deadly crime spree. Narrated by Alana De La Garza of the CBS series "FBI."

A con woman with 15 aliases and dozens of scams across 16 states. How the FBI outsmarted this mysterious grifter. Narrated by Alana De La Garza of the CBS series "FBI."

How an FBI cyber team captured the mastermind behind the Silk Road, an illegal online marketplace and multimillion dollar enterprise selling illicit items like drugs and weapons. Even murders for hire were discussed. Narrated by Alana De La Garza of the CBS series "FBI."

A gunman out for revenge. Government officials his targets. How FBI agents went undercover to stop his plan. Narrated by Alana De La Garza of the CBS series "FBI."