Stephen Return Riggs’ ‘Mary and I: Forty Years with the Sioux’, Good Free Kindle Classic Book, Deals Authors, Promote Your Book to 4 Million Readers. Become A Bestselling Author. Free Kindle Books – Classic Mary and I: Forty Years with the Sioux by Stephen Return Riggs. Price: Free. Genre: Classics, Literary. Rated: 4.3 stars on 6 Reviews. 242 pages. ASIN: B0831H1FSY.