In 2008, BBC cameras filmed two Swedish sisters throwing themselves into traffic on the M6. When it was shown on BBC One, nearly 7 million viewers were glued to their screens, and millions more watched it later on YouTube.
Now, two years later, this documentary reveals the full story of the hours just before the cameras captured that motorway footage, and the even more chilling story of what happened over next 72 hours, which left one of the sisters fleeing the scene of a crime, after she had stabbed a man through the chest.
