In Sweden, detectives hunt a madman that's targeting people of colour. And in Oregon, detectives discover extremists in their backyard - extremists with a murderous plan.

Detectives put their heads together to collar fame-seeking murderers. Some aren't satisfied just to maim and kill. They need to see their name in the paper. And that's how you catch them.

In Australia, detectives listen in as a brutal bludgeoner spills the beans to a curious cellmate. And in Mobile, Alabama investigators tune in as a lovesick shooter wants to explain her murdering ways - to the woman she's killed.

In New York, detectives catch a wife that's served up very nasty cocktails to two unsuspecting husbands. And in Connecticut, a criminologist and a detective convict a husband of using a woodchipper to get rid of his wife.

In Detroit, the police hunt a killer that draws his victims close, then slices their bellies wide open. And near Boston, a V.A. Special Agent teams up with a detective to catch a serial murderess - one that kills - with a syringe.

In Alabama, detective bust a preacher that uses Bible verses to justify killing and deep-freezing his wife. And in Kansas, detectives use every trick in the book to chase down and bust the internet's first serial killer.

In Italy, the elite Carabiniere Police Force bust a pair of star-crossed lovers that butcher an innocent family. And in America's west, detectives take down a vicious couple that kidnap, rape and kill their sex slaves.

In Georgia, detectives chase a hit man across several states, then chase the millionaire that hired the hit across the globe. And in Arkansas, FBI Special Agents hunt down a gang of triggermen - and the con men that hire them.