I read this years ago (it was published in 1980) and it has been on my 'to reread' shelf. This is a book rich with the history and geography of the Pacific Northwest. The main character is taking illegal Chinese immigrants across the Canadian border to San Francisco's Chinatown. Some great female characters. I got confused about who was chasing who and what was going on, but that was intended, I think. First line: "The fog, they say, its density and in winter its bitterness, is worst in Chinatown of all places in San Francisco."