In this booklet Jill Dudley speaks of the light that seems to envelop Delos, the smallest of all the Cycladic islands. She describes Homer's account of the god Apollo's birth which took place there, and how in antiquity it became a major centre of pilgrimage. Today it still attracts many thousands of tourists because of its excavations and its history. She takes the reader on a tour of the island, and explains the reason for the Athenian's annual sacred embassy to Delos.