This first part of a double album is really very good. Everything happens in the city and we discover that Tintin does not have to go halfway around the world to experience thrilling adventures. Buying a boat collection of our hero to the market (place that paves the way for Dupont to distinguish once again) attracts all desires. But it is a gift to Captain Haddock. Soon, it realizes that this boat is the reduced replica of its ancestor. The story of the adventures of chevelier of Haddoque is tasty. The reader is immersed in a pirate story while Snowy tries to avoid bombastic gestures captain. The two friends then realize that the unicorn leads to a treasure. This bodes well for the next episode ...