Hospitality is a funny game. After stopping at a roadside fruit and veg stand, we set up our Campingaz kitchen in Weissach town square. As C boils some eggs, a young man approaches. In broken German he asks us, 'Why you cook here? I have kitchen. Come.' And before we really know what we're getting into, our new friend Ahmad has led us away from the square, up steep back roads to a sports hall that overlooks the town. 'I live here,' he says, ushering us past two bored security guards, who scarcely look up from their mobile phones. Heckengau Sporthalle is home to around a hundred refugees, mostly from Syria, Lebanon and Afghanistan, packed into 'plastic' rooms that divide what used to be an indoor basketball court. The rooms are built for two or four, but Ahmad's second bunk is empty. He kicks some shoes under the bed and clears the table to prepare us some tea: our first taste of refugee hospitality. There are no ceilings to this cell and we can see...