It was 12:38 in the afternoon on January 13, 2006, when the call went out to police: a bank robbery in progress. Moments later, cops were racing through San Isidro, a leafy, affluent suburb north of Buenos Aires. When officers arrived at the scene—a tan two-story branch of Banco Río, one of Argentina's largest financial institutions—they were pleased to discover that the thieves were still inside.