The main protagonists of the adventures are two Britons, a top scientist called Philip Mortimer and an army officer called Francis Blake. The main antagonist of the series is their sworn enemy, Olrik, who has appeared in all but one of the books. Their confrontations take them into the realms of detective investigation and science-fiction, dealing with such themes as time travel, Atlantis and espionage. The books are generally set during the 1950s, though many were written after this decade (for instance The Sarcophagi of the Sixth Continent is specifically set in 1958 but was published in 2003).
New books are being published in the series currently, however they have been written and drawn by other people since the death of Jacobs. A television series based upon the series was produced in 1997, entitled Blake and Mortimer.
When Tintin magazine was launched on September 26, 1946, it included the story, Le secret de l’Espadon (The Secret of the Swordfish ) which introduced the characters of Captain Francis Blake of the British Intelligence Service, his friend Professor Philip Mortimer, a leading physicist, and their sworn enemy Colonel Olrik.
The epic of the Swordfish ended in 1949 but Olric, Blake and Mortimer continued their conflict through a whole series of science-fiction/detective stories that saw them go all the way from the lost continent of Atlantis to the Catacombs of Paris
After Jacobs’ death in 1987, Bob de Moor completed his unfinished last story. In the mid-1990s the series was continued by the Jacobs Studios with two teams of writers and artists: Van Hamme/Benoit and Sente/Juillard. The series was still firmly set in the 1950s and included many new regular supporting characters, most notably Blake's colleagues in the security services.
1996 saw the publication of The Francis Blake Affair. Purists immediately objected to the choice of Van Hamme and, upon publication, went on to discover some typical Van Hamme plot twists they disliked. Jacobs' science-fiction was noticiably absent with the story focusing on espionnage. However the book became a relative success and the publisher decided to continue the line. In the meantime however both Benoit and Van Hamme were tied up on other projects and work on the next book started to lag. As an interim solution, writer Yves Sente and artist André Juillard were contracted to publish another adventure, The Voronov Plot (1998) which took its theme from the Cold War.
Finally, Van Hamme and Benoit managed to finish their album and The Strange Encounter appeared in 2001, with Blake and Mortimer confronting mysterious alien creatures.
This was followed by Sente and Juillard's two-book adventure: The Sarcophagi of the Sixth Continent (volume 1,The Universal Threat in 2003; volume 2,Battle of the Minds in 2004), which actually deal with Blake and Mortimer's youth.
In the original Jacobs' version it is not specified that Blake and Mortimer are Welsh and Scottish. They are simply two proud Britons serving HM's Government. The post-Jacobs title, The Sarcophagi of the Sixth Continent, dwells on their early lives, showing how they met in colonial India.
Philip Mortimer was originally drawn from life. The model was a friend and sometimes collaborator of Jacobs, Jacques Van Melkebeke. There was one imaginative addition by Jacobs since Van Melkebeke had no beard. Francis Blake was modeled by another friend and sometimes collaborator of Jacobs, Jacques Laudy, with added mustache. Olrik was a self-portrait of Jacobs.
Blake and Mortimer are sometimes shown to live in the same house, sharing an apartment in the same manner as Sherlock Holmes and Doctor Watson. Many Belgian comics have had similar themes of confirmed bachelors living together, including Tintin and Captain Haddock, Spirou & Fantasio and Tif & Tondu.
Jacobs always drew his stories as being contemporary, and so the first few titles have a 1950s look and feel while the last installment looks decidedly 1970s. One exception to this rule is, again, Time Trap, which starts in the present but whose action, due to a malfunctioning time machine, largely takes place in the 51st century, and includes a short ventures in medieval times and a stopover in the Jurassic period. Post-Jacobs stories are based in the 1950s.
The layout in most of the stories include some similarities: when the adventure begins certain important but unseen events have already taken place: at the beginning of The Yellow Mark, for instance, the titular character has already made himself known through various activities which the reader only learns about when Mortimer reads a newspaper about these events.
Some of the adventures also end with the characters reflecting on what they have learned from their experiences: after his travels through time in Time Trap, Mortimer concludes that rather than dwell on the "good old days" or look forward to a "brighter future", one should be content with the present.
Like many Franco-Belgian comics, Blake and Mortimer has had limited publication in English.
Les Editions Blake and Mortimer published English translations of all three parts of The Secret of the Swordfish in 1986, both parts of The Mystery of the Great Pyramid in 1987 and The Yellow "M" in 1988.
In 1989, Catalan Communications, under its 'Comcat' line of books, planned to publish the books in inexpensive trade paperback copies in the US. They released:
There were also plans to release Secret of the Great Pyramid in 2 volumes, and then The Yellow Mark, but the company went under before they could get a chance to realize them.
Cinebook Ltd have been publishing English language translations of Blake and Mortimer since 2007. The following volumes have been released to date:
Further volumes are scheduled as follows:
In 1997, the company Ellipse made an animated series containing 26 episodes, which made up 13 stories, 4 of which were entirely new and not based on existing books.
Another example is the popular Belgian comic series concerning the adventures of MI5 agent Colonel Clifton. Clifton once featured in a story entitled Jade, published in 2003. In it he meets two characters called Blake and Mortimer, though even as caricatures they bear little resemblance (perhaps deliberately) to Jacob's originals. The story included elements from the original books, such as the secret passage from S.O.S. Météores and the cave that doubles as a submarine base in L'Affaire Francis Blake.
In 2005 Dargaud published a parody entitled Menaces sur l'Empire ("The Empire Under Threat"). This was a humorous presentation of the adventures of Blake and Mortimer and was certainly not part of the canon (in fact, the space reserved for the series' title reads "Les Aventures de Philip et Francis" as opposed to "Les Aventures de Blake et Mortimer"). Jokes included:
Tigresse Blanche (White Tigress) is another Belgian comic series featuring the adventures of a Chinese Communist woman spy in post-war China. It features a British agent, Sir Francis Flake, whose friend (based on Mortimer) gets drunk on the announcement of Indian independence.
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