Tintin and his friends are holidaying in Syldavia with Professor Calculus, who has invented an amazing new duplicating machine. But a series of strange occurrences makes Tintin suspicious. Who is the mysterious King Shark, and what does he want with Calculus' machine?
It is hardly surprising that this album, with competent but uninspired art by Bob de Moor, was one of the reasons why Hergé decided not to let anyone continue Tintin after his death. The story in all its silliness just about works as a film; as a comic strip, it's flat, much too clearly adapted from another medium, and slightly wooden.