In the 1970s, a quiet town in Wales became the home of two sisters who baffled doctors, psychologists, and the public. June and Jennifer Gibbons chose to sever all communication with the outside world, speaking only to one another in a rapid, secret language.
Their absolute isolation eventually led them down a dark path of crime and confinement in a high-security psychiatric facility. However, the most extraordinary element of their lives was a hidden agreement that dictated only one of them could ever truly survive.
The Secret World of Selective Mutism
Born in 1963, the identical twins moved with their family to Haverfordwest, Wales. As the only Black children in their community, they experienced intense bullying at school, which caused them to withdraw entirely from others. They stopped talking to teachers, peers, and even their parents.
Instead, they shared a deep bond, moving in perfect synchronicity and communicating in a high-speed patois that no one else could understand. When separated by well-meaning educators, they sank into catatonic states. Shut away in their bedroom, they spent years writing elaborate, dark novels and filling diaries with thousands of words about their intense, fraught relationship.
Crimes and Confinement at Broadmoor
As they entered their late teens, the sisters turned to reckless behavior. In 1981, they committed a series of crimes, including theft, vandalism, and arson. The legal system struggled to deal with their silent non-cooperation. In 1982, a court sentenced them to Broadmoor Hospital, a high-security psychiatric prison.
They remained locked away for eleven years alongside some of the country’s most dangerous criminals. Inside the facility, they maintained their refusal to speak to staff, often rotating who would eat and who would starve.
A Deadly Pact Fulfilled
During their confinement, the twins confided a dark secret to journalist Marjorie Wallace. They believed that their bond was a trap, and they reached a mutual decision that one sister had to die for the other to gain freedom. In March 1993, authorities arranged to transfer the twins to a lower-security facility in Wales.
Upon arrival, Jennifer suddenly became gravely ill. Hours later, she died at the age of 29 due to acute myocarditis, a sudden inflammation of the heart muscle. Doctors found no traces of poison or drugs in her system.
Following Jennifer’s death, June immediately began speaking normally to reporters and medical staff, stating that her sister had given her life so she could be free. June later returned to her community, living a quiet life without further psychiatric intervention.