"Tracking an underground language from one family's obsession to the outcasts who spoke it in order to survive. Centuries ago in middle Europe, a coded language appeared, scrawled in graffiti and spoken only by people who were "wiz" (in the know)-vagrants and refugees, merchants and thieves. This hybrid language was rich in expressions for police, jail, or experiencing trouble, such as "being in a pickle." And beginning with Martin Luther, German...