ADI SAT IN the back of the Land Rover as Jon Dreycott drove. Beside Jon, studying a paper map folded on her lap, sat Terri Yurikami, his wife. “Two more kilometers.” She frowned. “I think. Be easier if GPS worked out here.” They’d left Arequipa an hour ago, driving west then turning northeast to loop around Chacani, the west-most of three volcanoes north of the city. The roads were well-paved, and they’d made good time. According to a sign a while back, they were now driving through the Reserva Nacional Salinas y Aguada Blanca. It was high plateau country, the land stretching flat to a horizon dotted with isolated peaks of dead, dormant, and active volcanoes. Reserva Nacional Salinas y Aguada Blanca“You said it’s at a crossroads beside a weird rock formation?” Jon looked back at Adi, put

