Introduces some classic characters such as the Thompson Twins and Rastapopoulos but because it‘s redrawn from the 1930s and became last in the series rather than the 4th, the continuity becomes confusing. This vid explains it well: https://youtu.be/dIPvVZsEz7M. This story is acknowledged as being a growth in Herge‘s creativity ability with plot development, humour and intrigue. Despite the rewrite It‘s still amateurish and has racial stereotypes.