On the 25th June 1986, a routine journey across Spain turned tragic. In the early morning, a tanker truck carrying thousands of litres of sulphuric acid crashed whilst crossing the Somosierra mountain pass. But the driver was not alone. He had brought along his wife and 10-year-old son. When authorities arrived to investigate, they found something truly unexpected: the boy was missing. Over the ensuing months, hundreds of theories were considered, followed, and abandoned. Today, four decades later, the question still lingers: Where is Juan Pedro Martínez Gómez? MUSIC  Tracks used by kind permission of Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 Tracks used by kind permission of CO.AG Learn more about your ad choices. Visit megaphone.fm/adchoices