The second volume is a clear improvement!
We learn more about the various characters, new ones appear, intrigues grow ... some errors still remain, but you soon forget :)
Green Rider, Volume 2: The first rider
The last two are simply impossible to ask. It is truly charmed by this story, that will surely go on for a few tomes ... for the greatest pleasure of the fans! ^^
Green Rider, Volume 3: The Tomb of King-Supreme
Green Rider, Volume 4: The black veil
PS: for those who want to read English fairly simple (as it must be admitted that titles give better in the original language ... ^^)
Green Rider