June Gibbons and Jennifer Gibbons were twin sisters who grew up in Wales. They became known as "The Silent Twins", since they only communicated with each other. They wrote works of fiction. In 1981, the girls committed several crimes including vandalism, petty theft and arson, which led to them being admitted to Broadmoor Hospital high-security mental health hospital. The twins were sentenced to indefinite detention under the Mental Health Act 1983 and were held for eleven years.