You can find the official digital version of the legendary Call of Cthulhu campaign, , through legal storefronts like Chaosium and DriveThruRPG. While the latest 7th Edition is primarily available in English, there are several official resources and historical French editions to be aware of. Where to Buy the PDF
The answer lies in the content. Les Masques de Nyarlathotep is a campaign of "Lovecraftian horror" in its truest sense. It is not about killing monsters; it is about investigating the unknown and paying the price for that knowledge. A PDF version allows a Keeper (Game Master) to quickly search for clues, print handouts for players without destroying a physical book, and carry the entire campaign on a tablet. les masques de nyarlathotep pdf link