Which classic literary series underwent a major brand identity transformation in the early 2000s that included adult-oriented 'black editions' to expand its market beyond children?

The publishing industry relies heavily on brand identity to distinguish authors and book series in a crowded marketplace. Iconic book covers, consistent design elements, and recognizable author branding have become crucial marketing strategies. Test your knowledge about one of the most successful brand identity transformations in modern literature that revolutionized an entire genre's visual presentation and market appeal.

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Harry Potter series by J.K. Rowling
Chronicles of Narnia by C.S. Lewis
His Dark Materials by Philip Pullman
A Series of Unfortunate Events by Lemony Snicket