Captain Haddock home, Marlinspike Hall (or "Moulinsart" in the original French). Harry Thompson, author of "Tintin: Hergé and his creation", writes that the introduction of this large and luxurious country house was "to provide a suitable ancestral home for Tintin and himself to move into." To achieve this in terms of the plot, Hergé also details Haddock's ancestry, something Thompson regards as distinctive: "Haddock is the only regular character whose relatives turn up in the Tintin stories at all (if one discounts Jolyon Wagg and his dreadful family)." As Haddock's role grew, Hergé expanded his character, basing him upon aspects of friends,
Tintin and the Lake of Sharks with laughing gas and take the children away. Tintin and Haddock pursue them but fail to rescue Niko and Nouchka. The criminals leave behind a message on a tape player from their leader, "King Shark", who tells the heroes (with a voice which is startingly familiar to Tintin) that they will get the children back in return for Calculus' invention. Tintin himself is to do the exchange and is not to call the police. Tintin, Haddock, Calculus and the detectives search the house for bugs, and Tintin discovers a secret passage that leads to Madame Black's walkie-talkie hidden in the