If you believe the more hysterical newspapers, the quiet-spoken, articulate man I am meeting today in London is the biggest threat to our nation's youth since the Sex Pistols swore TV presenter Bill Grundy into oblivion.

Even Hillary Clinton has said her say, claiming that his work is “stealing the innocence of our children”.

You might think that a man this notorious would be a household name, but though the work he helps create has smashed sales records and made headlines worldwide, Dan Houser has stayed firmly out of the limelight, his entry on the all-encompassing online encyclopaedia Wikipedia stretching to a mere nine lines.