10/22/2014 09:55 am ET Updated Dec 22, 2014

Top Ten Best-Selling Ebooks -- Week of October 18

Gone Girl rounds out its fifth week at the top of the Digital Book World Ebook Best-Seller List as Jodi Picoult's Leaving Time debuts at No. 2.

Both titles retail for $4.99. The past few weeks saw higher-priced ebooks of $10 or more making inroads on the best-seller list, nudging the average price up to $8.39 last week.

But that figure takes a sharp downturn this week, dropping to $6.91 as some best-selling titles shed a few dollars and other less-expensive ebooks climb the ranks.

The top ten best-selling ebooks for the week ending October 18:

1. Gone Girl: A Novel by Gillian Flynn (Penguin Random House) -- $4.99

2. Leaving Time: A Novel by Jodi Picoult (Penguin Random House) -- $4.99

3. Gray Mountain: A Novel by John Grisham (Penguin Random House) -- $11.99

4. The Best of Me by Nicholas Sparks (Hachette) -- $5.99

5. The Heroes of Olympus (The Blood of Olympus Book 5) by Rick Riordan (Hachette) -- $8.99

6. Stepbrother Dearest by Penelope Ward (Self-published) -- $3.99

7. Deadline (Virgil Flowers Book 8) by John Sandford (Penguin Random House) -- $11.99

8. Burn (Michael Bennett Book 7) by James Patterson; Michael Ledwidge (Hachette) -- $4.99

9. Dark Places: A Novel by Gillian Flynn (Penguin Random House) -- $4.99

10. Captivated by You (Crossfire Book 4) by Sylvia Day (Penguin Random House) -- $7.99

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