The massive British coinage clanks in his pocket like pewter dinner plates. Lawrence Pritchard Waterhouse walks down a street wearing the uniform of a commander in the United States Navy. This must not be taken to imply that he is actually a commander, or indeed that he is even in the Navy, though he is. The United States part is, however, a safe bet, because every time he arrives at a curb, he either comes close to being run over by a shooting-brake or he falters in his stride; diverts his train of thought onto a siding, much to the disturbance of its passengers and crew; and throws some large part of his mental calculation circuitry into the job of trying to reflect his surroundings through a large mirror. They drive on the left side of the street here.