An amateur linguist loses control of his creation.

In 1962, Siffre spent two months living in total isolation in a subterranean cave, without access to clock, calendar, or sun. Sleeping and eating only when his body told him to, his goal was to discover how the natural rhythms of human life would be affected by living “beyond time.”

Inside the minds of the two people, one with the world’s best memory and one with the world’s worst.