Tintin, Captain Haddock, Professor Calculus and Thomsom and Thompson go for a treasure hunt in this episode. At end of the book finally they find the treasure and Captain buys back his family estate Marlinspike Hall with help from Professor Calculus.

Tintin's plane crashes in India. Here he finds Sarcophagus who is effected by Rajaijah juice, poison of madness. He meets the Maharaj of Gaipajama whose family has been fighting the opium business. With the Maharaja's aid and by his presence of mind Tintin captures the whole gang and stops the Opium business in those areas.