11 books • 3 series
Scarab Dawn (Collective Trilogy, Episode 1)
Arnold Saves the Neighborhood Clip Strip (Hey Arnold!)
Arnold Saves the Neighborhood (Hey Arnold!)
Arnold's E-Files (Hey Arnold! Chapter Books, #8)
Arnold's Christmas (Hey Arnold! Chapter Books, #7)
Mystery of the Bermuda Triangle (Hey Arnold! Chapter Books, #6)
Summer Love (Hey Arnold! Chapter Books, #5)
Parents Day (Hey Arnold! Chapter Books, #4)
Arnolds Valentine (Hey Arnold! Chapter Books, #3)
Arnold for President (Hey Arnold! Chapter Books, #1)
Return of the Sewer King (Hey Arnold! Chapter Books, #2)