A spy sits down at a bar...
A spy sits down at a bar ready to pass along the secrets he has learned; secrets that must not ever get into the wrong hands. He is waiting to meet a total stranger, about whom he knows nothing except that they will be wearing a black hat. The spy worries that he won't be talking to the right person, but he trusts the one who arranged the meeting. Finally someone sits next to him. He steals a quick glance; it's a woman in her sixties wearing a black baseball cap. "The crow flies at midnight" she says. It's what he had been waiting to hear. She's the one.