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Top 10 Best-Selling Ebooks -- Week of February 21

02/25/2015 10:35 am ET | Updated Apr 27, 2015

It may seem odd to call To Kill a Mockingbird, a classic novel as well as a classic film -- and currently the No. 17 best-selling ebook -- a "media tie-in" the way that plenty of its compatriots on the Digital Book World Ebook Best-Seller List are, like Fifty Shades of Grey or Gone Girl.

But the term isn't a value judgment on either the books in question or the films they give rise to. And while Harper Lee's return to the Best-Seller List is almost certainly due to anticipation for her recently rediscovered Go Set a Watchman, rather than excitement surrounding a film release, To Kill a Mockingbird still offers a good reminder that best-selling books and movies have complemented each other for quite some time.

All that considered, it's perhaps noteworthy to find Paula Hawkins's The Girl on the Train settle into its fourth week at No. 1, even while a considerable handful of media-tie ins filled out the spots beneath it in the week heading into the Oscars.

The top ten best-selling ebooks of the week ending February 21:

1. The Girl on the Train: A Novel by Paula Hawkins (Penguin Random House) -- $8.99

2. Fifty Shades Freed (Fifty Shades of Grey Trilogy Book 3) by E L James (Penguin Random House) -- $4.99

3. Gone Girl: A Novel by Gillian Flynn (Penguin Random House) -- $4.00

4. Fifty Shades of Grey by E L James (Penguin Random House) -- $2.99

5. Big Little Lies by Liane Moriarty (Penguin Random House) -- $3.99

6. American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History by Chris Kyle; Scott McEwen; Jim DeFelice (HarperCollins) -- $4.00

7. All the Light We Cannot See by Anthony Doerr (Simon & Schuster) -- $11.99

8. The Nightingale by Kristin Hannah (Macmillan) -- $12.99

9. Obsession in Death by J. D. Robb (Penguin Random House) -- $10.49

10. A Spool of Blue Thread: A Novel by Anne Tyler (Penguin Random House) -- $10.99

See the rest of the top 25 best-selling ebooks this week.