In the summer of 1978, a one-day trip to a Mediterranean island takes a tragic turn when visitors get into an argument with Vittorio Emanuele of Savoy.

After her brother's death, Birgit seeks for justice. When every attempt seems vain, a lawyer from Paris willing to help finally shows up.

Years later, Vittorio Emanuele goes to trial. Birgit hopes that the truth will be finally unveiled, but unexpected witnesses show up for the Prince.