The Adventures of Sam Spade, Detective. date, two, Deputy Sheriff Bill Woodington, Marin County Sheriff's Office, San Rafael, California, from Samuel Spade, San Francisco license number one three seven five nine six, subject, The Battles of Belvedere. Dear Bill, by this time I should have known better, and I did. Per square mile, there are more screwballs in your stamping ground across the bay than should happen even to me. But Belvedere Island is very small, and I'd always…