Which brand storytelling technique revolutionized book marketing in the 2010s by creating immersive 'story worlds' that extended beyond the books themselves?

In the competitive publishing world, brand storytelling has transformed how books are marketed to readers. One particular technique revolutionized how publishers create emotional connections between readers and literary works, leading to unprecedented engagement. Test your knowledge about this influential shift in literary marketing that changed how publishers position their authors and titles in the digital age.

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Transmedia storytelling (using multiple platforms to create interconnected narrative experiences)
Epistolary marketing (releasing fictional letters/documents from characters)
Author persona development (creating carefully crafted public identities for writers)
Companion content marketing (selling supplementary materials like maps and encyclopedias)