On a road from England, a car runs towards Hasley's military airport. On board, Major Rupert Humbletweed, who is in charge of a secret mission for the British government. At the Centaur Club in London, Captain Francis Blake diners from an overcooked roastbeef with his friend, Professor Philip Mortimer. He entrusts him with an operation of the utmost importance: going to Pakistan to modify the activation code of the Espadons stored at Makran's base, in order to allow their transfer to Scaw-Fell, England. Blake, who has just taken over the direction of MI 5, must then leave for the Ulster: according to one of his agents, the IRA would prepare a major plot against England... First screenwriter to have taken over the adventures of Blake and Mortimer, with L'Affaire Francis Blake, Jean Van Hamme imagines a continuation of the inaugural album of the series, Le Secret de l'Espadon, which he had discovered during his publication in the series "The Secret of the Espadon, which he had discovered during the works of the "Edecks by Peter's.