The corridor opened into a room arranged like an airport station; a long glass wall spanned its full length to show a crowd of people waiting at a checkpoint, a row of technicians monitoring displays and watching from this side. Alice paused. At first, the members of the crowd looked identical—with their bald heads and blue stripped uniforms—but after a moment she picked out individuals: a well-built man with a reprinted arm talking to a small girl; a young couple arm in arm as if they were on a first date; a heavyset man with a cane, full of determination.