You can find various PDF versions of Tintin in Switzerland online. However, I must advise you to be cautious when downloading files from unknown sources, as they might contain malware or be copyrighted without permission.
Tintin in Switzerland is the ninth book in The Adventures of Tintin series, created by Belgian cartoonist Georges Remi, alias Hergé. The story was first published in 1931 and has since been translated into multiple languages.
Keep in mind that Tintin in Switzerland is still under copyright in many countries. Be respectful of the author's and creators' rights by only downloading PDFs from authorized sources or purchasing the book.