First of a two-part documentary exploring one of the strangest cases in modern British history In May 2008, Swedish twin sisters Ursula and Sabina Eriksson travelled to England and caused carnage by running repeatedly into traffic on a busy stretch of the M6 in an apparent suicide pact. While Ursula was air lifted to hospital for emergency surgery, Sabina was arrested and held in custody, but an unnerving comment she made while in custody soon took on a dark dimension