An encounter with eccentric Egyptologist, Seán Ó Tuama, takes Tintin and his faithful dog, Báinín, in search of the tomb of Pharaoh Kí-Oskh. But the king's resting place contains a dark secret ... a strange clue leads Tintin and Báinín into the hands of drug smugglers, as they find themselves in vicious conflict with a major international criminal.