The unfortunate truth of modern policing is that despite all the DNA tests, criminal profiles and surveillance technology it's still extremely difficult to catch a killer. Random killers, who murder as a passion, can elude even the most highly trained and well equipped of police forces. Luckily, they tend to give themselves away. Killers is a documentary series that tells the surprising story of how some of Europe's and America's most horrific murderers were eventually brought to justice. It's a story of shocking crimes and bizarrely simple blunders, that takes the audience behind the worn-out stereotype of the criminal mastermind to reveal the very ordinary men who commit the most inhuman of crimes.