1. The Lunar Chronicles by Marissa Meyer
Number of books: 4
Last book released: Nov. 10
Marissa Meyer's dystopian retelling of classic fairytales came to a magical conclusion this year, leaving fans begging for a spin-off.
2. Penryn & the End of Days by Susan Ee
Number of books: 3
Last book released: May 12
Penryn Young's battle against the angels that took over her world came to a thrilling conclusion in End of Days.
3. True Love Trilogy by Kieran Scott
Number of books: 3
Last book released: Feb. 3
Kieran Scott's romantic YA spin on Greek mythology left readers swooning with its happy conclusion.
4. Splintered Series by A. G. Howard
Number of books: 3
Last book released: Jan. 6
A. G. Howard perfectly concluded her Alice in Wonderland inspired trilogy with Ensnared this year. Fans can jump back into Wonderland one last time with the companion novel, Untamed, which will be released on Dec. 15.
5. The Iron Fey by Julie Kagawa
Number of books: 7
Last book released: Oct. 27
Julie Kagawa perfectly tied up loose ends in the epic conclusion to her popular Iron Fey series.
6. Finishing School Series by Gail Carriger
Number of books: 4
Last book released: Nov. 3
All the skills Sophronia learned were put to the test in the thrilling finale of Gail Carriger's kick ass series.
7. The Gilded Series by Christina Farley
Number of books: 3
Last book released: Sept. 29
Christina Farley brought heroine, Jae Hwa Lee's, magical Korean adventure to a great close with Brazen.
8. Elemental Trilogy by Sherry Thomas
Number of books: 3
Last book released: Oct. 13
Sherry Thomas' magical saga concluded with an epic battle between protagonists Iolanthe and Titus and the forces of Atlantis.
9. Scarlet Trilogy by A. C. Gaughen
Number of books: 3
Last book released: May 19
Scarlet and Robin Hood's love was put to the test as they faced their biggest challenge ever in Lion Heart.
10. Maximum Ride Series by James Patterson
Number of books: 9
Last book released: May 18
James Patterson gave fans the perfect grand finale to end Max's amazing, post-apocalyptic story.
11. Taken Series by Erin Bowman
Number of books: 3
Last book released: April 14
Gray Weathersby had to face off against some of his greatest foes in the mind blowing conclusion of Erin Bowman's suspenseful trilogy.
12. Paper Gods Series by Amanda Sun
Number of books: 3
Last book released: June 30
After spending a year in Japan, Katie Greene had to fight powerful gods to save her boyfriend, Tomo, before it was too late.
13. Nevermore Trilogy by Kelly Creagh
Number of books: 3
Last book released: July 28
After a three year wait, fans finally got the closure they needed and discovered the intertwined fates of Isobel and Varen.
14. The Mortality Doctrine Series by James Dashner
Number of books: 3
Last book released: Nov. 17
Michael and his friends go head to head with the powerful Kaine in the exciting conclusion to James Dashner's latest trilogy.
15. Dispossessed Trilogy by Page Morgan
Number of books: 3
Last book released: April 14
The Waverly Sisters learned to survive on their own while facing their biggest foes in this magical conclusion.
16. The Kanin Chronicles by Amanda Hocking
Number of books: 3
Last book released: Aug. 4
Fans of Amanda Hocking's Trylle trilogy were rewarded with the return of some of their favorite characters in Crystal Kingdom.
17. Hemlock Trilogy by Kathleen Peacock
Number of books: 3
Last release date: Jan. 6
Kathleen Peacock gave fans the answers they've been waiting for in the final book of this supernatural trilogy.
18. Pulse Series by Patrick Carman
Number of books: 3
Last book released: Feb. 24
Fans said goodbye to Patrick Carman's futuristic world and telekinetic wielding characters with the release of Quake.
19. At Somerton Series by Leila Rasheed
Number of books: 3
Last book released: Jan. 6
With Somerton left without an heir, everyone was forced to decide what it was they truly wanted in this surprising finale to Leila Rasheed's historical romance series.
20. The Dark Elements Series by Jennifer L. Armentrout
Number of books: 3
Last book released: July 28
Seventeen-year-old Layla was forced to make some hard choices in the conclusion of Jennifer L. Armentrout's popular series.
21. Bloodlines Series by Richelle Mead
Number of books: 6
Last book released: Oct. 13
This spin-off series to Richelle Mead's popular Vampire Academy series came to a close as Sydney and Adrian went up against their biggest foes.