Which famous publishing marketing campaign introduced the slogan 'Read it before they spoil it' during a major book release, implementing unprecedented security measures to prevent plot leaks?

The publishing world isn't just about words on pages—it's also a marketplace where branding, marketing campaigns, and consumer behavior intersect with literature. Major publishing houses have created some of the most recognizable branding in retail, while authors themselves have become powerful brands. Test your knowledge of the business side of the literary world with this challenging question about an iconic publishing marketing campaign.

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Harry Potter and the Deathly Hallows (Bloomsbury/Scholastic)
The Da Vinci Code (Doubleday)
Gone Girl (Crown Publishing)
The Girl with the Dragon Tattoo (Norstedts Förlag/Knopf)