In Ali’s Café, just inside Turkey on the Bulgarian border, Iraqi and Syrian refugees spend their days drinking tea. Now and then, someone goes into the back room to give bundles of money to smugglers who have promised to get him into the European Union. Only when piano chords strike up on the radio does Kapka Kassabova realise what Ali’s reminds her of: Rick’s Bar in the movie Casablanca, a transit realm ‘where the homeless of the day come in search of passage’.