He learns that until his recent death the island had been owned by one Shelley Arabin, a man with a reputation for violence and evil who had used the house for dissolute orgies at which ancient pre-Christian Greek gods were worshipped.
Leithen and Vernon are introduced to Koré, a young woman who outrageously flouts the expected manners of her class.
Not fully understanding the depths of the Greek locals' fear and hate, Koré is stubbornly determined to return to the island to expiate her father's evil legacy.
Leithen recognises Koré's naivety behind her confident facade, but in spite of his advice she leaves England for Plakos.
Aided by a Greek army officer, Captain Maris, Leithen attempts but fails to gain access to Koré's house, where she is being held prisoner.
He watches in the moonlight as on a flat area of land known as the Dancing Floor young men take part in a ritual race, the winner having the honour of selecting the male victim who is to die with Koré.
Finally, as the flames rise, Koré and Vernon are seen boldly walking out towards the silent villagers, dressed in white as pagan deities summoned by the ancient rite.