Sentenced to the execution platoon for a desertion of too many, Blutch finds himself imprisoned, with the mysterious Isabella Boyd, herself hit with capital punishment for intelligence with the enemy. Escape with the latter, the former corporal integrates a group of southern conspirators, who will ask him to shoot down President Lincoln! Blutch, pacifist by nature, will he manage to resist the insistence of his new "friends"? This is expected to be complicated, because the charms of the beautiful Isabella seem to distance him from the arms of Chesterfield who, feeling guilty of arresting his friend, desperately seeking...