Apple updated the cover of The Swift Programming Language to match the new book in the series, but deleting and redownloading the book within iBooks in OS X Mavericks didn’t update the cover — it continued to display the original cover.
The solution was to quit iBooks, delete the iBooks cache located at ~/Library/Containers/com.apple.iBooksX/Data/Library/Caches/com.apple.iBooksX, and restart iBooks.
You’re welcome, Internet.
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