How many books are there in the rangers apprentice series?

There are 12 books in the Rangers Apprentice series, written by John Flanagan.

Here's a breakdown:

* The Rangers Apprentice (1 book)

* The Ruins of Gorlan (1 book)

* The Siege of Macindaw (1 book)

* The Battle of Hackham Heath (1 book)

* The Sorcerer of the North (1 book)

* The Kings of Clonmel (1 book)

* The Lost Stories (1 book, a collection of short stories)

* The Ranger's Apprentice: The Royal Ranger (1 book)

* The Ranger's Apprentice: The Outcast (1 book)

* The Ranger's Apprentice: The Field of Roses (1 book)

* The Ranger's Apprentice: The Emperor of Nihon-Ja (1 book)

* The Ranger's Apprentice: The Last Guardian (1 book)