While on holiday in Rhodes, Athenian war hero Darios becomes involved in two different plots to overthrow the tyrannical king, one from Rhodian patriots and the other from sinister Phoenician agents.
Glaucus, a demobilized centurion returns home to Pompeii to find his father murdered by a gang of black-hooded Christian robbers that terrorizes the city and he decides to investigate the matter while the nearby volcano threatens to erupt.
Shortly after his return from India, a special agent of the British secret service falls victim to an insidious poisoning in London. Scotland Yard gets involved. But too late: valuable information has fallen into the hands of an international criminal gang...