27 books • 3 series
Book #1: Miniature World of Marvin and James
Book #2: James to the Rescue
Book #3: Trouble at School for Marvin & James
Book #4: Marvin & James Save the Day and Elaine Helps!
Book #5: A Trip to the Country for Marvin & James
Book #1: Missing on Superstition Mountain
Book #2: Treasure on Superstition Mountain, Book Two
Book #2: Treasure on Superstition Mountain
Book #3: Revenge of Superstition Mountain