Herman Webster Mudgett, better known as Dr. Henry Howard Holmes or H. H. Holmes, was an American serial killer. While he confessed to 27 murders, he was convicted and sentenced to death for only one murder, that of accomplice and business partner Benjamin Pitezel.

What happens when a state sanctions the evil acts of a twisted mind belonging to a man who everyone addresses as doctor? This is the story of one such man, Josef Mengele, also known as The Angel of Death.

In this episode, dwell into the mind of "The Milwaukee Monster", Jeffrey Dahmer.

A look at one of Britain's most notorious killers who was never found.

This documentary looks into the lives and minds of Dylan Klebold and Eric Harris and what led them to one of the deadliest mass shootings in modern United States history: Columbine High School. What made these two seemingly ordinary boys turn into killers? Were there signs, could they have been stopped, or were they born to kill?

Who can you trust if you can't even trust your doctor? A look into the mind of this silent, unlikely killer.

"The Rostov Ripper". A look into the mind of one of the most insane killers to have ever lived.

This documentary is the result of extensive research looking at the life and mind of Theodore Robert Bundy to try and understand what drives an outwardly normal man to commit some of the most heinous acts ever recorded.

The names Norman Bates, Buffalo Bill and Leatherface are all heinous, psychotic characters in some of the most horrific horror movies of all time. All despicable human beings that commit monstrous acts against their fellow humans, surely these heinous characters could never exist in real life? Ed Gein proves us wrong.