Who wrote it?

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Across
  1. 3. The Book Thief
  2. 4. The Hunger Games
  3. 7. Harry Potter series
  4. 8. Geronimo Stilton books
  5. 12. Me Before You
  6. 13. Things Fall Apart
  7. 14. Flowers in the Attic
  8. 16. Fault in Our Stars
  9. 17. And Then There Were None
  10. 19. Life of Pi
  11. 20. Where the Crawdads Sing
Down
  1. 1. Jack Reacher novels
  2. 2. Sophie’s World
  3. 5. The Prophet
  4. 6. Fifty Shades of Gray
  5. 9. Angela’s Ashes
  6. 10. It Ends With Us
  7. 11. A Wrinkle in Time
  8. 15. All the Light We Cannot See
  9. 18. Gone Girl