"It was right after the revolution," George continued. One afternoon, Hemingway told him, "There's something you should see." The nature of the expedition was a mystery; Hemingway made a shaker of drinks, daiquiris or whatever. They got in the car with a few others and drove some way out of town. They got out, set up chairs and took out the drinks, as if they were going to watch the sunset. Soon, a truck arrived. This, explained George, was what they'd been waiting for. It came, as Hemingway knew, the same time each day. It stopped and some men with...