there are 10
so far 10
There are 10 volumes completing the series.
There are currently 20 books.
There are 4 books in the series.
There are two books in the series.
There are 6 books in this series.
There are currently 5 books in the series.
There are eleven books in that series
27.5 is a lot of books in the series i think the correct answer would be 15 books in the series
13 books are in the series
21 books in this series so far
There are three books in the night world series