40 books • 9 series
Book #39: Caravan
Book #43: Home in Time for Christmas
Book #2: Journey Under the Sea
Book #2: The Haunted House
Book #4: Space and Beyond
Book #4: Lost Jewels of Nabooti
Book #4: Your Very Own Robot (Choose Your Own Adventure - Dragonlark)
Book #13: Cup of Death
Book #14: The Case of the Silk King
Book #21: Mona is Missing
Book #21: Struggle Down Under
The Lost Ninja
Book #6: House of Danger
Book #16: Secret of the Ninja
Book #36: Owl Tree
Book #53: The Case of the Silk King
Book #81: Terror in Australia
Book #119: The Terrorist Trap
Book #127: Showdown
Book #143: Project UFO
Book #29: The Fairy Kidnap
Book #1: The Clue in the Clock Tower
Book #2: The Haunted Swamp
Book #3: The Case of the Missing Formula
Book #4: Science Lab Sabotage
Book #4: The Locker Thief
Book #14: The Search for Champ