The Invisible Worm

Puzzle Adventures: The Pyramid Plot/the Emerald Conspiracy/the Invisible Spy (Usborne Puzzle Adventures, Book 3)

Invaders!

Kill Radius (The Executioner #251) (Executioner, 251)

Scooby-Doo and the Alien Invaders (Scooby-Doo! 8 X 8 (Paperback))

The Mystery of the Missing Dog (Invisible, Inc.)

The World of Nature Invisibles: Hidden Picture Puzzles

The Invisible Collection/Buchmendel

The Invisible Enemy (Graywolf Short Fiction)

Invaders from Within (Choose Your Own Adventure, No 110)