Hello Reader! Level 4

The invisible boy, Chip, intends to enter his invisible dog Max in the dog show, but then Max goes missing.

Oh no! Someone has been stealing snacks from the classroom! Only an invisible boy and his friends can solve this mystery.

When the Invisible Inc. gang makes computer greeting cards to raise money to invite an author to school, they solve the mystery of the author's real name.

Invisible Inc., the mystery-solving trio with an invisible friend, is back on the case. They must help Justin find his missing karate belt—he can't do anything right in karate class without it.

When Charlene's prize-winning paper disappears on Parents' Night, Invisible Inc. comes to the rescue in this illustrated classroom mystery. Full color.