On the 25th of June 1986, a routine journey across Spain turned tragic. In the early morning,

a tanker truck carrying thousands of litres of sulfuric acid crashed whilst crossing the Somo

Sierra 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 Martinez-Gomez? The

The Spain in the 1980s was a nation on the move.

Spain in the 1980s was a nation on the move.

Following the death of dictator Francisco Franco in 1975,

the country underwent a rapid transformation into a modern democratic state.

But such a transition has its positives and negatives.

Where workers now found themselves with new opportunities, so too did more nefarious elements of society. This is important to understand

because many feel that Juan Pedro Martinez-Gomez's disappearance and the truck crash that

killed his parents were anything but

accidental. And perhaps they have a point. Juan Pedro's father, Andres, was a professional

truck driver from Morcia, a town near Spain's Mediterranean coast. Earlier in the month,

he'd been commissioned to deliver a tanker of highly

toxic sulfuric acid to the northern city of Bilbao, a journey of around 500 miles.

As the route would be rather scenic and the journey would take several days, Andres decided to

allow his wife Carmen and son to accompany him.

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