In the medieval Castilian village of Guzmán (population: 80), villagers have gathered for centuries in the 'telling room' to share stories and drink the local wine. It was here, in the summer of 2000, that Michael Paterniti found himself listening to a compelling tale about a cheese made from an ancient family recipe that was reputed to be among the finest in the world. Until, Ambrosio said, things had gone horribly wrong. Hooked on the story, Paterniti relocated his young family to...