04/02/2014 09:27 am ET Updated Jun 02, 2014

Top Ten Best-Selling Ebooks -- Week of March 29

The first two books in the Divergent series continue to occupy the top spots in this week's Digital Book World Ebook Best-Seller List, but a new title by best-selling author Nora Roberts is giving them a run for their money.

That's the latest sign of increasing competition by Penguin Random House for HarperCollins, which so far has thoroughly dominated the first quarter's rankings. Five of the top ten best-selling ebooks this week are Penguin Random House titles.

The top ten best-selling ebooks for the week of March 29:

1. Divergent (Divergent series) by Veronica Roth (HarperCollins) -- $4.99

2. Insurgent (Divergent series) by Veronica Roth (HarperCollins) -- $6.99

3. Shadow Spell: Book Two of The Cousins O'Dwyer Trilogy by Nora Roberts (Penguin Random House) -- $7.99

4. Allegiant (Divergent series) by Veronica Roth (HarperCollins) -- $6.99

5. The Divergent Series Complete Collection by Veronica Roth (HarperCollins) -- $14.99

6. The Maze Runner (The Maze Runner series #1) by James Dashner (Penguin Random House) -- $1.99

7. The Fault in Our Stars by John Green (Penguin Random House) -- $7.99

8. Missing You by Harlan Coben (Penguin Random House) -- $11.99

9. The Invention of Wings: A Novel (Original Publisher's Edition--No Annotations) by Sue Monk Kidd (Penguin Random House) -- $10.99

10. Hidden by Catherine McKenzie (Amazon) -- $4.99

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