Return of the Headless Horse

In checking out the comments to my post Hail to the Headless Horse! about Paul Berna's 100 Million Francs, otherwise known as The Horse Without a Head, you will see that I made the astonishing discovery that there was a sequel to that novel.

In fact, if the list of information given in this great review of The Horse Without a Head is correct, there are three sequels to the original! The reviewer on "Freaky Trigger" briefly discusses the plot of the second book, which takes place two years later. I found this plot description of The Mystery of Saint-Salgue on e-Bay (cover picture here): "Gaby and his gang of friends have acquired a racketty old Citroen which holds all ten of them as well as eleven stray dogs. In it they set off for a camping holiday in the South of France. During the first night out they meet two strangers from Canada who charm them with talk about a village called Saint-Salgue from which the Canadians believe their home in the prairie took its name. The gang soon realises that the name Saint-Salgue has a mysterious significance not only for their new-found friends but also for two unfriendly characters who are trailing their van." I have not found any information about the fourth book.

• A Hundred Million Francs (Le Cheval sans tête), 1955
• The Street Musician (Le Piano à bretelle), 1956
• The Mystery of Saint Salgue (La Piste du souvenir), 1962
• Gaby and the New Money Fraud, 1971

There also appears to be at least two books about Inspector Sinet, the police officer who helps the children in Horse Without a Head:

• The Mule on the Motorway aka The Mule on the Espressway (Le Commissaire Sinet et le mystère de l'autoroute du sud), 1967
• A Truckload of Rice (Le Commissaire Sinet et le mystère des poissons rouges), 1968

Anyway, majorly cool!