Female serial killers have always been something of an anomaly in criminology and a puzzle for law enforcement. It is a popularly held belief that women, being ‘the fairer of the sexes’, are less capable of murder than men. It has been proven, however, that women killers are meticulous, methodical and quiet in committing their crimes and, on average, the time-line of women killers usually spans eight years before they are caught - double that of a male serial killer. In this six-part factual documentary series, Britain's leading and most visceral crime writer Martina Cole takes an up close and personal look at some of the most significant cases of female serial killers in history. From Myra Hindley to Beverly Allitt and Rosemary West, Martina examines the life histories and careers of some of the most notorious female killers - re-examining evidence and providing a comprehensive portrait of the sociological backgrounds that may have helped create these killers.