(There were few other passengers: a man in an overcoat, his head sunk against his chest; a couple with arms around each other, impervious to their surroundings; and a teenage boy with a black scarf wound round his neck, Zorro-style. Isabel smiled to herself: a microcosm of our condition, she thought. Loneliness and despair; love and its self-absorption; and sixteen, which was a state all its own.)