You can tell a lot about a man by the contents of his wallet.

There are two licenses in Sam's wallet. The most recent, issued in the state of Maryland, sports a picture of a lean and unsmiling man, hair short and dark, face pale. Behind it is the older license, the California license with the stranger's picture. His hair is longer and lightened by the sun, his jaw rounder, softer. He is tan, and his lips are slightly curved in the beginnings of a smile.

Behind the licenses there is a narrow strip of shiny paper, two black and white photos of the strange man and a smiling blonde woman. There used to be four pictures. He likes to think she kept hers, too.