It was the myth of Achilles, whose mother tried to make him immortal. She burned away his mortality with fire, in one telling of the story, and Achilles was left impervious to injury everywhere except his heel, where a poisoned arrow would eventually wound and kill him. In another telling, the infant Achilles was immersed in the River Styx, the river that divides the world from the underworld. His mother held her baby by his heel to dip him in the water, leaving, again, one fatal vulnerability.
May have to follow this book up with “song of Achilless”
