There are 3 books in the Five Nights At Freddy's series. The newest book is The Fourth Closet which came out in 2018.

1
The Silver Eyes

By Scott Cawthon , Kira Breed-Wrisley ,

Book cover of The Silver Eyes
Ten years after the horrific murders at Freddy Fazbear's Pizza that
ripped their town apart, Charlie, whose father owned the restaurant,
and her childhood friends reunite on the anniversary of the
tragedy and find themselves at the old pizza place which had been
locked up and abandoned for years. After…
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2
The Twisted Ones

By Scott Cawthon , Kira Breed-Wrisley ,

Book cover of The Twisted Ones
The highly anticipated sequel to the bestselling Five Nights at Freddy's:
The Silver Eyes.

It's been a year since the horrific events at Freddy Fazbear's Pizza,
and Charlie is just trying to move on. Even with the excitement
of a new school and a fresh start, she's still haunted by…

3
The Fourth Closet

By Kira Breed-Wrisley , Scott Cawthon ,

Book cover of The Fourth Closet
The pulse-pounding conclusion to the bestselling Five
Nights At Freddy's trilogy.

What really happened to Charlie?

It's the question that John can't seem to shake, along
with the nightmares of Charlie's seeming death and miraculous
reappearance.

John just wants to forget the whole terrifying saga of Freddy
Fazbear's Pizza, but…