Which groundbreaking advertising campaign involved placing mysterious symbol posters in major cities worldwide before revealing they were related to Dan Brown's 'The Da Vinci Code'?

The publishing world has seen some revolutionary advertising campaigns that transformed books from simple literary works into cultural phenomena. These campaigns didn't just sell books—they created movements, sparked conversations, and changed how we think about marketing literature. Test your knowledge about one of the most innovative book marketing campaigns that reshaped the publishing industry and how readers discover new titles.

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The Symbologist's Quest by Random House
Penguin's 'Decode the Mystery' street art installation
HarperCollins' 'Secret Society' viral marketing campaign
Simon & Schuster's 'Hidden Messages' subway takeover