He had a Cambridge degree, a respected lecturing job, and a Twitter feed full of awkward selfies and dinosaur photos. To anyone who knew him, Matthew Falder seemed completely harmless.
But behind that ordinary appearance, he was secretly operating on the dark web under the name “666devil”.

What investigators eventually uncovered was so disturbing it took authorities from five countries four years to piece together the full extent of his crimes.
When they finally arrested him, seasoned detectives said they had never encountered anything like it.