18 books • 4 series
The Palette of 12 Secret Colors, Volume 6 (Palette of 12 Secret Colors Graphic Novels, #6)
The Palette of 12 Secret Colors, Volume 4 (Palette of 12 Secret Colors Graphic Novels, #4)
The Palette of 12 Secret Colors, Volume 3 (Palette of 12 Secret Colors Graphic Novels, #3)
The Palette of 12 Secret Colors, Volume 2 (Palette of 12 Secret Colors Graphic Novels, #2)