Identical twins June and Jennifer Gibbons, raised in a small Welsh town, became notorious as "the silent twins" for their inability to communicate with anyone except each other. Developing their own language, they would become catatonic when separated. The story follows the twins as they face a choice: to survive and potentially be separated at Broadmoor psychiatric hospital, or to die together.

The Silent Twins
The movie is about identical twins June and Jennifer Gibbons, known as "the silent twins", who have a unique habit of only talking to each other and shunning all outside interactions.