Von Krantz - a strange paraplegic physicist - has developed the Annulator, a device capable of defusing nuclear charges. He lives reclusively in his villa with his daughter, Sylvaine, and his assistant, Yvan. The secret services of the world's major powers inevitably seek to steal the plans for his invention. And so begins a ballet of spies, all as zany as they are burlesque, which is the originality of The Unknown of Shandigor - Jean-Louis Roy's first feature film. After restoration, the film was given a second life at the Locarno Film Festival in 2016 - where it had its Swiss premiere in 1967. In January 2021, Les Journées de Soleure celebrated its fifty-sixth edition. In tribute to its director Jean-Louis Roy, who passed away in March 2020, the Solothurn festival reprogrammed The Unknown of Shandigor. The film was already well received there the year of its release, and was seen by some journalists, including Freddy Landry, as proof that a «young Swiss cinema exists».