Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he locates stolen jewels, retrieves a stuffed tiger, and more. Solutions are included at the back of the book.

Fifth-grader Cam Jansen uses her photographic memory to help find a pickpocket at the circus.

Cam uses her photographic memory to find a shopping list that her dad lost at the library.

The Hardy boys find themselves involved in a dangerous adventure when a blind peddler delivers a mysterious message.

When eight-year-old sleuth Cam Jansen and her friend Eric go to a birthday party, she uses her photographic memory to solve the puzzle of the dinosaur count. When fifth-grader Cam Jansen and her friend Eric go to a birthday party, she uses her photographic memory to solve the puzzle of the dinosaur count.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

Harry and his detective classmates try to find clues relating to a mysterious locked closet in Room 3B.

When the Team Spy Gear learns that somebody has the ability to create a super fast and super smart computer that would make banks, the military and national security vulnerable, their mission is to find out who it is and stop them.

Though it means Nate can't get his dog ready for the smartest pet contest, he agrees to search for the missing prize for the contest.

When the Team Spy Gear learn of the existence of a pack of deadly nano-entities that can mimic landscape, morph into other forms, and learn, adapt, and evolve, they must find a way to stop these evil swarms quickly.