Triple pack of documentaries investigating three famous mass murderers. 'Charles Whitman - The Texas Sniper' looks inside the mind of the former alter boy and Eagle Scout who claimed the University of Texas Clock Tower in 1966 and killed 14 people and wounded 31 others with his high-powered rifles. Interviews with those who knew him well and excerpts from Whitman's own writings reveal how his murderous personality was formed and why his violent nature was hidden for so long. In 'The Boston Strangler',in 1965,Albert DeSalvo confessed to being the Boston Strangler,who had killed 13 women in a year-long rampage that had terrorised the city. But there have always been doubts about the validity of DeSalvo's confession and conviction. This programme chronicles the controversy surrounding the case. Finally,in 'Charles Manson',in two nights in 1969,Charles Manson and a ragged band of followers rewrote the standards of criminal brutality,killing seven people including actress Sharon Tate in the cruelest ways imaginable. When the killers were finally caught,the nation was introduced to the small,bizarre,ex-con who was the guru of a ragtag 'family'.