The Silkworm, J.K. Rowling as Robert Galbraith's follow-up to the bestselling The Cuckoo's Calling, hit #2 on Apple's iBooks bestseller list for the week ended June 23. (Cuckoo sat at #4 on the chart.) John Green's The Fault in Our Stars stayed put at #1, and Janet Evanovich's Top Secret Twenty-One, the author's newest Stephanie Plum novel, out June 17, landed in the #3 spot.

iBooks US Bestseller List

1. The Fault in Our Stars by John Green - 9781101569184 - (Penguin Group US)

2. The Silkworm by Robert Galbraith - 9780316206914 - (Little, Brown and Company)

3. Top Secret Twenty-One by Janet Evanovich - 9780345542946 - (Random House Publishing Group)

4. The Cuckoo's Calling by J.K. Rowling & Robert Galbraith - 9780316206860 - (Little, Brown and Company)

5. All Fall Down by Jennifer Weiner - 9781451617801 - (Atria Books)

6. If I Stay by Gayle Forman - 9781101046340 - (Penguin Group US)

7. Mr. Mercedes by Stephen King - 9781476754468 - (Scribner)

8. The Goldfinch by Donna Tartt - 9780316248679 - (Little, Brown and Company)

9. The Target by David Baldacci - 9781455521234 - (Grand Central Publishing)

10. Insurgent by Veronica Roth - 9780062114457 - (Katherine Tegen Books)

11. Invisible by David Ellis & James Patterson - 9780316405409 - (Little, Brown and Company)

12. Orange Is the New Black by Piper Kerman - 9780385530262 - (Random House Publishing Group)

13. Looking for Alaska by John Green - 9781101434208 - (Penguin Group US)

14. Allegiant by Veronica Roth - 9780062209276 - (Katherine Tegen Books)

15. Unlucky 13 by James Patterson & Maxine Paetro - 9780316211284 - (Little, Brown and Company)

16. The Matchmaker by Elin Hilderbrand - 9780316329026 - (Little, Brown and Company)

17. A Game of Thrones by George R. R. Martin - 9780553897845 - (Random House Publishing Group)

18. The A Song of Ice and Fire Series by George R. R. Martin - 9780345535535 - (Random House Publishing Group)

19. Gone Girl by Gillian Flynn - 9780307588388 - (Crown Publishing Group)

20. The One & Only by Emily Giffin - 9780345546890 - (Random House Publishing Group)