In 1932,
Tintin, a reporter for
Le Petit Vingtième, goes with his dog
Snowy on an assignment to
Chicago,
Illinois,
to fight against the city's organised crime syndicate. Soon after
arriving there, Tintin and Snowy are kidnapped by gangsters and brought
before mobster boss
Al Capone, whose
criminal enterprises in the Congo were previously thwarted
by Tintin. With Snowy's help, Tintin subdues his captors, but as he
goes to inform the police, they reject his claims, and the gangsters
escape while Tintin is away. After surviving attempts on his life,
Tintin meets Capone's rival
Bobby Smiles,
who heads the Gangsters' Syndicate of Chicago. Tintin is unpersuaded by
Smiles' attempt to hire him, and after Tintin orchestrates the arrest
of his gang, Smiles escapes and heads west.