The series originally consisted of twelve books, with the eleventh book being a collection of short stories and the twelfth being a follow-up novel set 16 years later. A prequel series, ', has released two titles, the first in 2015 and the second in 2016. A spin-off series, "Brotherband", which is set in the same universe, though with new characters, started in 2011. The sixth book in the "Brotherband" series came out in June 2016. In 2018 the twelfth book of the "Ranger's Apprentice" series was renamed and made the first book in a sequel series, '.