Edgar P. Jacobs

A necklace that used to belong to Marie Antoinette, the last French queen before the French Revolution, turns up in the hands of a British collector who decides to present it to Queen Elizabeth. Blake and Mortimer's sworn enemy Olrik, about to be tried in Paris, manages to escape and steals the precious piece of jewellery in front of their very noses during a glittering reception in the French capital. The affair threatens to turn into a full-blown diplomatic incident, especially since Olrik is doing his best to embarrass Blake and Mortimer by tipping off the press about his every move.

Extreme weather threatens the whole of continental Europe, turning the lives of its citizens inside out. The French government calls Professor Mortimer to help solve this enigma. Mortimer travels near Paris to visit his friend Professor Labrousse, the chief French meteorologist. But when the taxi driver Labrousse sent to meet Mortimer at the station disappears, our friend becomes the prime suspect. Mortimer gets in touch with his old friend Blake, also in France, to help him out of this tricky situation. However, Blake disappears as well, so Mortimer and Labrousse have two missing-person cases to investigate. They soon discover that the two disappearances are not only linked to each other, but also to the climatic catastrophes.

Captain Blake seems to have lost the first round in Part 1, having been assassinated at Athens airport. But a furious Mortimer swears that he'll never stop trying to avenge his friend. He goes on the hunt, but information is scarce. Strange happening occur when he comes under the protection of Sheik Abdel Razek and Mortimer soon feels like he's losing his way in his investigation which will lead him to the darkest depths of the Great Pyramid...

Professor Philip Mortimer has decided to spend his holidays in Cairo with his trusty servant, Nasir. There he plans to meet an old friend, who offers him the fantastic opportunity of satisfying his passion for Egyptology - to take part in the deciphering of some recently discovered papyrus coming from mummies of the Ptolemaic age. They soon discover that one of the fragments deals with the Chamber of Horus - a fabled crypt that could contain priceless treasures...

The |Yellow Mark| is a criminal that has London enthralled in his exploits: holding up the Bank of England, robbing the imperial crown and many more. The Home Office asks Captain Francis Blake to discover the identity of the man who hides behind the Yellow Mark. Blake immediately calls upon his old friend, Professor Philip Mortimer, to help him unmask this mysterious criminal.