"Caligula", young emperor, reigns as a just and wise monarch. The death of "Drusilla", his sister and his mistress, however, will turn him into a bloodthirsty monster. Confronted with the absurdity of existence, he will immerse himself in it with all the force of hatred that the disappearance of the being he loved most in the world aroused in him. He refutes the notions of good and evil, executes and destroys ...