The Secret of the Swordfish

The first volume, "Ruthless Pursuit", opens on the eve of a World War. Details are scarce, but the reader is told that the enemy is an Asian superpower known as "the Yellow Empire", ruled by the Emperor Basam Damdu; the free world and the Yellow Empire have been locked in a cold war for the past three years. Within the first few pages of the book, the Yellow launch a worldwide aggression with modern rockets, bombers and paratroopers that quickly destroy and conquer the world's other major powers. However, the British military has been secretly working on a new type of superweapon known as the Swordfish, in anticipation of the war. Forewarned of the attack by a traitor in the Yellow army, Captain Francis Blake, a British officer, and Professor Phillip Mortimer, the scientist developing the Swordfish, escape with the superweapon's plans, their destination being a secret base in the Middle East where they will be able to finish their work.

The rest of the episode follows their attempts to escape the pursuing Yellow forces, led by the cunning and conniving Colonel Olrik, Basam Damdu's chief of security. They initially escape from Britain in a jet-powered airplane called the "Golden Rocket", but are shot down somewhere over Iran by Yellow interceptors, and must continue the trek to the secret base on foot. Along the way, they encounter resistance fighter Ahmed Nasir, who becomes an invaluable help to them, and finally seek refuge in a small town in the Herat province. There, they are quickly betrayed by a Yellow spy. The episode ends with a cliffhanger: the soldiers of the Yellow army are directed to the room where Blake and Mortimer are staying and as they enter they find an astonishing surprise (naturally the reader can only see their reaction, not the cause of it).

"Mortimer's Escape" takes place in two distinct halves. The first one picks up right where "Ruthless Pursuit" left off. After finding the room empty, the enraged Yellow commander orders his troops to search the city until they find Blake and Mortimer; the commander executes one of the community's elders in the process when the latter refuses to cooperate. This sparks an immediate insurrection in which the outraged townsmen quickly massacre the Yellow troops; in the ensuing chaos, Blake and Mortimer emerge from hiding and take off again, still with Nasir helping them. Eventually, the three of them make it to the Strait of Hormuz, but Blake is injured and loses the wallet containing the Swordfish plans while trying to escape a Yellow patrol. Mortimer then tells Nasir to take Blake to safety, while he returns to search for the plans. He is himself then captured by Yellow troops, but not before he is able to find and conceal the plans.

The second half of the episode begins three months later in Lhassa (the Yellow capital), with Colonel Olrik making a report to the high council of the Yellow Empire. The Yellow are having more and more difficulty controlling their new empire; rebellions and acts of terrorism have continued worldwide, and despite their best efforts, they have still not been able to sweat the Swordfish plans out of Mortimer. As chief of the Empire's security service, Olrik is the natural scapegoat for this state of affairs; he therefore decides to take the gloves completely off and torture Mortimer as harshly as necessary, hoping to finally elicit a confession. Under instructions from Nasir, who has managed to infiltrate his prison, Mortimer pretends to relent, and agrees to reconstitute the Swordfish plans for the Yellow.

After this, in the secret base, Blake and the admiral in command, Sir William Grey, have been conducting resistance against the Yellow (including many of the incidents that Olrik is being blamed for). They now have two urgent priorities; first, to find the lost plans and second, to break Mortimer out of prison. The first problem is resolved when Mortimer is able to pass a message to Nasir telling him where the plans are hidden. Soon after this, Mortimer almost manages a prison break on his own; before the Yellow are able to capture him, he is rescued by Blake and Nasir, who then take him to a submarine and manage to escape under the nose of the Yellow navy and air force.

"SX1 counterattacks", the third part of the saga, begins soon after Mortimer's escape. In the first pages, British commandos attack and capture a Yellow train taking imprisoned scientists to a forced labor camp. The scientists are freed and taken back to the Hormuz base, where they also begin to work on the Swordfish project. Soon after this, acts of sabotage begin to disrupt the base, and Blake suspects that one of the captured scientists was actually a Yellow mole. This is eventually revealed to be none other than Olrik himself, who personally undertook the operation in an attempt to reestablish his reputation before the Emperor. Olrik manages to escape from the base, and the British are faced with an imminent Yellow invasion. Mortimer suggests a drastic solution; concentrate all the base's efforts on the assembly of only two working Swordfish, which should be enough to destroy a Yellow invasion force. He estimates thirty hours are all the time needed to accomplish this, and Admiral Grey gives him his word that the base will hold.

The next morning, a vast Yellow task force, composed of an aircraft carrier battle group and a number of land and air forces, appears and surrounds the base. The initial attacks are defeated and turned back by the heroic efforts of the British. Olrik then deploys new chemical weapons against the base, which allow the Yellow to gain a foothold and slowly begin to work their way inwards, but both Mortimer and Grey keep their word, and the two Swordfish (designated SX1 and SX2, hence the title) are finished in time. The weapons, piloted by Blake and Mortimer, are unleashed and destroy the Yellow task force in minutes, though one of them is lost in combat. The base is saved, and Sir William Grey launches a radio call to the resistance movements of the world telling them the news and urging them to revolt.

In the following week, open rebellions erupt worldwide, taxing the overextended resources of the Yellow to the limit until the Emperor decides to end the war by launching ICBMs against all the rebel targets (with Olrik strapped to one of the rockets as punishment for his failures). Before he can do this, however, an entire squadron of Swordfish arrives over Lhassa and nukes the city, killing Basam Damdu and decapitating the Yellow Empire under Olrik's mocking eyes. The last scene shows Blake and Mortimer back in a ruined and destroyed London, with Blake commenting that they will rebuild and that civilization, once again, has had the last word - "hopefully, this time, for good".