Peter Lorre was not Swiss. He was Hungarian, born in Rosenberg. You might be interested in the new biography on Peter -- "The Lost One: A Life of Peter Lorre", by Stephen D. Youngkin. This is the book's official website:
http://www.peterlorrebook.com. You can order the book there through several on-line merchants. On this site, you will also find a biographical sketch of Peter, written by Mr. Youngkin, Peter's authorized biographer. Unlike so much of what you'll find on Peter on the internet, this sketch is accurate.