Four days when Janet Fitzsimmons must at all costs reassure the board of directors of the Mayflower Foundation, whose members are worried about popular demonstrations against the American government. For this, nothing better than to place in the White House a solid, calm, and above all, completely under his control thanks to a chip implanted in the brain. And this man is all found: her husband, Jason MacLane, in other words, XIII! She must check that the chip still works, rigging the next elections, and ensuring that the place of Vice-President is vacant... Four days for authoritarian President Thomas Allerton to keep full powers, towards and against everything, and therefore shoots XIII. Four days during which Jason Mac Lane must at all costs save democracy in his country, on the one hand by preparing for the return of Carrington and Jones, still refugees in Canada; on the other, by orchestrating the disclosure of the secrets recorded on the recorded audio cassette of Moscow. And all this by giving the change to his wife and avoiding the attempts to assassinate her country, on the other hand, are fortunately helping the very good Captain Ska and helping the very good one.