"This way," walking briskly down a row of those seriously private British toilet-caves. Not cubicles, or stalls, but actual narrow little closets, with real doors. This was usually the first cultural difference Milgrim noticed here. Englishmen must experience American public toilets as remarkably semicommunal, he guessed. The man gestured him into a vacant toilet-room, glanced back the way they’d come, then quickly stepped in, closing the door behind him, locked it, and handed Milgrim a plastic sandwich bag containing a blue-topped sample bottle. Milgrim propped the red cardboard tube, carefully, in a corner.