The Royal Ranger is a series of novels written by John Flanagan. It centers around Madelyn Altman, the titular "Royal Ranger," the apprentice of Will Treaty. It takes place after the Ranger's Apprentice series.
Although Flanagan originally stated that A New Beginning would be the last book in the Ranger's Apprentice series, the second book in the royal ranger series has nevertheless been released. There are also 15 rangers apprentice books so far.