In Greece at the time of antiquity. In the year 600 before Christ, the 45th Olympic Games are held, which are all in the sign of the old city-renown Sparta-Athens.
Margot Santorini is an aristocratic woman in 1936 in Greece, who amuses herself pursuing a shallow loveless affair with a nobleman, but unexpectedly falls in love with a political activist.
In Agatha Christie's most twisted tale, a spy-turned-private-detective is lured by his former lover to catch her grandfather's murderer before Scotland Yard exposes dark family secrets.