It’s been several months since the events of The Yellow M, but the evil of Professor Septimus still echoes around London. Important figures of the capital’s jet set come together around the questionable values the mad scientist defended. Olrik is forced to resort to opium in order to forget he was guinea pig. As for Mortimer, he too is trying, albeit for more humanist reasons, to revive certain aspects of Septimus’s work – to Blake’s extreme concern...

World War Three is over. Basam Damdu has been defeated. England can breathe and begin the rebuilding process ... or so it thinks. In China, unfortunately, Mao’s Communists keep bowling over Chiang Kai-shek’s troops, and are threatening Hong Kong. And General Xi-Lee, a ruthless warlord, has dreams of becoming the new Qin Shi Huang – first Emperor of China. When a relic of that very emperor is discovered by an acquaintance of Mortimer, things take a turn for the worst ...

Tasked by the queen to close the ‘Septimus Wave’ case once and for all, Captain Blake is facing a daunting task, for many questions remain unanswered. Where did the spaceship buried beneath London come from? What became of Lady Rowana and Professor Evangely? Meanwhile, Mortimer is trying to pull Olrik out of the catatonic state the villain has been in since his encounter with the ship’s occupant. Has the threat to the nation truly been vanquished?

Is the master of the Yellow M back? Captain Francis Blake, dashing head of England's MI5. Professor Philip Mortimer, world-renowned nuclear physicist. The most distinguished duo of gentleman-adventurers, battling the forces of evil and their arch nemesis Olrik around the globe, below the earth, even across time itself... The 20th adventure of Her Majesty's finest protectors!

1944. England is still locked in a struggle to the death with Nazi Germany. But already a new threat looms among the peaks of the Himalayas. For now, though, Squadron Leader Blake, having saved London from a German prototype, is assigned to a top secret mission, during which he meets with an old friend he hasn’t seen since India: Philip Mortimer. Soon, the pair are introduced to an officer working for Allied Intelligence: Colonel Olrik...

Professor Mortimer is bequeathed an old house in France by a former adversary: Miloch, the evil genius of SOS Meteors fame. Along with the house is a letter inviting the Briton, as the only man of worthy intellect, to discover a fabulous invention left behind by the departed. Following recorded instructions, Mortimer activates the device ... and wakes up a hundred million years in the past! Thus begins an incredible odyssey through time...

One evening in Tokyo, air traffic controllers detect an unknown flying object and send two aircraft to intercept and identify it. However, the fighters’ last message before they crash into each other is ‘ryu’ – dragon! The whole business has deeply upset Professor Sato Akira, and he calls upon his friend Mortimer, who can always be counted upon for good advice. But before he’s even received the invitation, Mortimer is already targeted by men hell bent on getting rid of him...

Mortimer is brought to the camp of General Li Hsi, the Chinese warlord, where he is reunited with a seriously injured Nasir. The professor was kidnapped in order to recover the archaeological proof of the general’s imperial lineage, but also to repair the Red Wing, a formidable combat aircraft Olrik unwittingly delivered. While Blake moves heaven and earth to find him and protect Hong Kong, Mortimer escapes to go in search of the only thing that can save Nasir: a legendary pearl ...

In Venice, a boating accident leads to the discovery of a 400 year old text bearing the signature ‘W.S.’ and promising the truth about the ‘Shakespeare mystery’. That very night, someone tries unsuccessfully to steal the precious document. The discoverer, Marquis Stefano Da Spiri, decides to send a copy of the document to a specialist of the Bard in London for stylistic authentication. As for the original, he entrusts it to an old comrade in arms from WW2: Captain Francis Blake...

Several months after the end of the Third World War – won thanks to the Swordfishes, the formidable jet bombers designed by Professor Mortimer – England is dismantling its base in the Makran, from which the final counter-attack was launched, and where the surviving airplanes are still kept. But in the shadows, devious schemes are being hatched, and while Mortimer is busy preparing his Swordfishes for repatriation, Blake is in Ireland, where rumour has it the IRA has some sinister plans – and even worse allies ...