It was cloudy and cool on the day when a team of researchers met Berina (not her real name) in the summer of 2017. She was standing near the rusty carcass of a car that was abandoned beneath the giant baobab that had become the regular gathering point in Onesi, a district capital in northern Namibia, about 25km from the Angolan border.
Berina was tall, her skin darker than the locals, her hair woven in a tightly braided spiral. She had the distinctive colourful earrings and necklace that suggested she’d come across the border from Angola. Her frame was wrapped in a blanket, and she clutched an ostrich leather purse.