This is the Hundred-and-twenty-fifth in my one-book-at-a-time bookshelf.
For me the Tintin adventure really gets going with this book and its companion, Red Rackham's Treasure. The Haddock character gets a depth beyond expectation and beyond what had been glimpsed in the two previous books in which he featured. His engaging and colourful back story provides the grist for a mysterious mystery that Tintin pursues with typical tenacity, aided in the usual manner by the bumbling detectives. I'm not surprised that Spielberg chose this story line for his (in my opinion) successful translation of Tintin to the big screen. It is a ripper.