An encounter with eccentric Egyptologist, Seonachan MacSeonachan, takes Tintin and his faithful dog, Dìleas, in search of the tomb of Pharaoh Cì-Osg. But the king's resting place contains a dark secret ... a strange clue leads Tintin and Dìleas into the hands of drug smugglers, as they find themselves in conflict with a major international criminal.