S. A. S. Versus the C. I. a

Son Altesse Sérénissime or SAS is a series of espionage novels created by French author Gérard de Villiers, featuring Austrian prince Malko Linge as the main character. More than 120 million copies have been sold globally, mostly in French, scoring in the top 25 of the best-selling book series of all time, behind Frédéric Dard's San-Antonio with 200 million copies sold worldwide.