Tintin finds a briefcase at the Park and goes to return it to its owner, professor Alembick, who is a sigillographer. The professor is invited to Syldavia to study the royal seals. On Tintin's way out Tintin overhears his name in a conversation. Tintin follows one of the men and goes to a Syldavian restaurant where he overhears some more conversation concerning Professor Alembick's invitation to the Syldavia. That night Tintin gets a strange phone call from a man who wants to meet him about some important