The FBI's investigation into MS-13 in Boston is complicated by an informant's unsanctioned crimes.

The FBI joins forces with the state police to infiltrate, disrupt, and dismantle MS-13 in Boston.

An FBI undercover sting on corrupt New Orleans police turns deadly when one dirty cop orders a hit.

The disappearance of an Oklahoma woman offers new leads in the shooting deaths of two young girls.

The FBI is called in to help investigate the mysterious shooting of two girls in rural Oklahoma.

In 2003, a deadly bank robbery goes cold-until new DNA leads to a shocking breakthrough.

A bomb threat at a casino ends in an explosion, leading the FBI to a surprising suspect.

A journalist reports on his own murders, evades police across continents, and plots again.

Austrian police and the FBI hunt a killer strangling women with their bras -- until he vanishes.

When a small-town bank gets a note saying a couple has been kidnapped, the FBI races to find them.

DNA links the Scarborough Rapist to the murders, revealing a killer couple with a chilling secret.

The FBI aids police in tracking a serial rapist-turned-killer as teen girls start turning up dead.