The Adventures of Tintin: The Secret of the Unicorn (video game) wants to get the third scroll, and that he is in fact Allan's boss. After a fight with Allan, Tintin gets the third scroll and heads off to Brittany, where he and Haddock earlier identified as Sir Francis' hideout. Learning that the scrolls contain the coordinates of the treasure of Red Rackham, Tintin and Haddock plan to head there, but Haddock is kidnapped by Allan, who uses him as a hostage to get the scrolls. After rescuing Haddock, Tintin discovers that the treasure is hidden within Marlinspike Hall. There they find the treasure and Thomson and Thompson arrest Allan and
Captain Haddock the time of their last completed and published adventure, "Tintin and the Picaros", Haddock had become such an important figure that he dominates much of the story. Captain (Archibald) Haddock's ancestor, Sir Francis Haddock, is hinted at being the illegitimate son of the French Sun King (Louis XIV), a possible reference to Hergé's own family history— Hergé liked to believe that his father was the illegitimate son of the Belgian king Leopold II. As Hergé was considering names for his new character, he asked his wife, Germaine, what she had cooked for dinner. She told him, “a sad English fish—haddock.”