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. Both women were admitted to Broadmoor Hospital, where they were held for 11 years.

Broadmoor Hospital is a high-security psychiatric hospital in Crowthorne, Berkshire, England. It is the oldest of England's three high-security psychiatric hospitals, the other two being Ashworth Hospital near Liverpool and Rampton Secure Hospital in Nottinghamshire. The hospital's catchment area consists of four National Health Service regions: London, Eastern, South East and South West. It is managed by the West London NHS Trust.