1 Once Upon a Time

Anna Heath was the mother of three young children and a brilliant languages professor. She was also a fictional character—part of the game Perplex City, which was a two-year-long treasure hunt developed by UK games company Mind Candy that attracted tens of thousands of players and sold more than a million puzzle cards.

One night in late July 2006, Anna disappeared. Her colleagues desperately tried to put together the pieces of where she had last been seen and by whom. Her husband appealed to the public for something, anything, that would ensure her safe return home.

But it was all for nothing. The search for Anna eventually turned up her body in the catacombs beneath the city. She had been brutally tortured and murdered while ...

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