Sometime in the Twelfth Century two children appeared from a pit on the edge of a field in the Suffolk village of Woolpit.
They were coloured green and spoke a unknown language.
They sickened until they were allowed to eat green beans.
The boy died but the girl revived and grew up learning English, marrying a man from Kings Lynn, and speaking of the place she and her brother had come from.
Susannah Clapp and Richard Mabey investigate the story and its remarkable enduring appeal to villagers, visitors and a succession of folklorists and writers.
Who were the green children of Woolpit and why are peope still fascinated by them?