A quartet.
By analogy of the word "trilogy" for a series of 3 books, a single word for a series of 5 books would be a "pentalogy". This word is derived from the greek: 'penta' (meaning "five") and '-logy' (from "logia" - for which one meaning is "a collection of words").
Mark Crilley has written twenty-four books. They include the ten volume Akiko series, and a series called Miki Falls with four volumes.
There are four books in the Thirst series by Christopher Pike.
There are four books in Stephanie Meyers Twilight Saga.#1-Twilight#2-New Moon#3-Eclipse#4-Breaking DawnNote: There is a book series called a Saga it will always contain four books.
The series of books is called the Chronicles of Narnia.
A big group of books is called a library.I call a group of books a group of books.
There are 6 books in each series, so 24 in total for the first four series.
The book series has four books. The first one if called Hush Hush, the second, Crescendo, the third Silence and the fourth Finale.
There are four books.
One word is quartet.Some others are tetrad and foursome.If they are four people, a jocular term is "gang of four".
There are only four books in the Twilight Series. It goes: Twilight, New Moon, Eclipse, and Breaking Dawn.
A series of 10 books is commonly referred to as a decalogy.