The 'Silent Twins' who were so close one of them had to DIE so the other could survive: Sister of girls held in Broadmoor for eleven years reveals lifelong heartache caused by their sinister bond

'Silent Twins' June and Jennifer Gibbons made a pact to cut themselves off from the world, with a secret language to keep them apart. But their passionate love-hate relationship would prove to be their downfall and, ultimately, may have lead to Jennifer's death. Aged 19, the twins were detained in the infamous psychiatric hospital Broadmoor for 11 gruelling years, after a five-week spree of vandalism and arson. On the day they were released, Jennifer collapsed and died from a sudden and unexplained inflammation of the heart. Now, 23 years later, their older sister Greta has broken her silence to reveal the terrible toll the incarceration had on the family.