It's encouraging to know that things like this really happen, even if it takes a toll on the investigator.
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Specialist online investigator Greg Squire had hit a dead end in his efforts to rescue an abused girl his team had named Lucy.
Disturbing images of her were being shared on the dark web - an encrypted corner of the internet only accessible using special software designed to make owners digitally untraceable.
But even with that level of subterfuge, the abuser was conscious of "covering their tracks", cropping or altering any identifying features, says Squire. It was impossible to work out who, or where, Lucy was.
What he was soon to discover was that the clue to the 12-year-old's location was hidden in plain sight.