There are 4 books in the The Raven Cycle series. The newest book is The Raven King which came out in 2016.

1
The Raven Boys

Book cover of The Raven Boys
'There are only two reasons a non-seer would see a spirit on St. Mark's Eve,' Neeve said. 'Either you're his true love ... or you killed him.'Every
year Blue Sargent stands next to her clairvoyant mother as the
soon-to-be dead walk past. Blue never sees them - until this year,…
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2
The Dream Thieves

Book cover of The Dream Thieves
The second thrilling book in Maggie Stiefvater's The
Raven Cycle quartet.
Now that the ley lines around Cabeswater have been woken, nothing
for Blue and Gansey will be the same. Ronan is falling more and
more deeply into his dreams ... and his dreams are intruding more
and more into…

3
Blue Lily, Lily Blue

Book cover of Blue Lily, Lily Blue
The third mesmerising book in Maggie Stiefvater's The
Raven Cycle quartet.
The third book in the mesmerising RAVEN CYCLE quartet from bestselling
author, Maggie Stiefvater. Fans of the SHIVER trilogy will
love this new quartet.

For the first time in her life, Blue Sargent has found a place
where she…

4
The Raven King

Book cover of The Raven King
The fourth spellbinding book in Maggie Stiefvater's The
Raven Cycle quartet.
All her life, Blue has been warned that she will cause her true
love's death. She doesn't believe in true love and never thought
this would be a problem, but as her life becomes caught up in the
strange…