Which classic literary series was the first to use a consistent, branded look across all its covers that became so iconic that the publisher Penguin Books based their entire company identity on it?

Throughout history, some of literature's most iconic works have transcended mere storytelling to become powerful brands with distinctive visual identities. From publishing innovations to marketing breakthroughs, these literary phenomena revolutionized how books are presented to consumers. Test your knowledge about the intersection of literature and brand identity with this challenging trivia question!

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The Sherlock Holmes series by Arthur Conan Doyle
The Penguin Classics series, beginning with E.V. Rieu's translation of Homer's 'The Odyssey' in 1946
J.R.R. Tolkien's Middle-earth books (The Hobbit and Lord of the Rings)
Agatha Christie's Hercule Poirot detective novels