Father Ioannis, a young Catholic priest on the island of Tinos, Greece, accidentally discovers the testament of the French priest, Jean Meslier. Born in 1664 and died in 1729, Meslier was the first atheist Catholic priest and an ardent adversary of the Pope, the French monarchy, and the aristocracy. Some say that the story of atheism begins with Father Jean Meslier and that his will influenced ; the French-German philosopher, Paul-Henri Thiry, Baron d'Holbach; the French poet, philosopher and theorist, Sylvain Maréchal, and even himself. Little by little, Father Ioannis, whose faith had already been shaken, begins to support Meslier's theories, and after a trip to Meslier's birthplace in the Ardennes, he decides to confess his atheism to his parishioners.