William Suff murdered at least a dozen women in 1980s-90s California while posing as a helpful, community-minded neighbour — and had killed before, as a system failure.

Steve Wright, the 'Suffolk Strangler', murdered five sex workers in Ipswich in just six weeks in 2006, triggering the largest manhunt in the east of England.

Patrick Mackay, the 'Devil's Disciple', was a psychopath who confessed to 11 killings in 1970s Britain but was convicted of three. One of the UK's forgotten killers.

Vaughn Greenwood, the 'Skid Row Slasher', murdered homeless men in 1970s Los Angeles. A flawed police profile and society's neglect helped him kill undetected.

The story of Robert Black, the Scottish delivery driver and serial killer who abducted and murdered young girls across the UK in the 1980s before one of Britain's largest manhunts caught him.

Maxim Petrov, a St Petersburg doctor dubbed 'Doctor Death', murdered elderly patients with lethal injections to rob them. A chilling betrayal of medical trust.

Sergei Ryakhovsky, the towering 'Balashikha Ripper', murdered 19 people around Moscow between 1988 and 1993 in one of Russia's most disturbing serial-killer cases.

The story of Nannie Doss, the 'Giggling Granny': a grandmotherly American poisoner who killed husbands, children and relatives with arsenic over nearly three decades.

Kendall Francois murdered eight women in Poughkeepsie, New York, hiding their bodies in the home he shared with his family — until a survivor came forward.

Michel Fourniret, the 'Ogre of the Ardennes', murdered young women and girls across France and Belgium with his wife as bait — one of Europe's most chilling killing duos.

Saeed Hanaei, the 'Spider Killer', murdered 16 women in the holy city of Mashhad, claiming a religious mission — and disturbingly drew public sympathy in Iran.

A comprehensive account of Ivan Milat, the 'Backpacker Murderer': the Belanglo discoveries, his seven victims, the survivor who caught him, and the 1996 trial.

Derrick Todd Lee murdered at least seven women around Baton Rouge. A flawed assumption about the killer's race slowed a hunt finally cracked by DNA.

The story of Andrew Cunanan, the charismatic American spree killer who murdered five men in three months in 1997 — ending with fashion designer Gianni Versace — before taking his own life.

Timothy Krajcir murdered women across the American heartland in the 1970s-80s, evading justice for decades until DNA solved the cold cases in 2007.

Carroll Cole, the 'Barfly Strangler', murdered women he met in bars across several US states, driven by a deep hatred rooted in childhood abuse. He was executed in 1985.

Amelia Dyer profited from Victorian Britain's trade in unwanted infants — and murdered the babies in her care. Convicted of one killing, she is suspected of hundreds.

The comprehensive story of John Christie of 10 Rillington Place, his eight victims, the wrongful hanging of Timothy Evans, and how the case helped abolish the UK death penalty.

The full story of Peter Kürten, the Vampire of Düsseldorf: his brutal childhood, the 1929 reign of terror, his 1931 trial, execution, and lasting influence on criminology.

Anthony Hardy, the 'Camden Ripper', murdered and dismembered women in north London. His case exposed how a dangerous man slipped through the mental-health system.