- The Secret of the Old Clock by Carolyn Keene
- The Hardy Boys series by Franklin W. Dixon
- Encyclopedia Brown, Boy Detective by Donald J. Sobol
- The Boxcar Children series by Gertrude Chandler Warner
- The Westing Game by Ellen Raskin
- The London Eye Mystery by Siobhan Dowd
- The Case of the Missing Marquess by Nancy Springer
- The Mysterious Benedict Society by Trenton Lee Stewart
- The Secret Series by Enid Blyton
- The Gollywhopper Games by Jody Feldman
- The Name of this Book is Secret by Pseudonymous Bosch
- The Secret Keepers by Trenton Lee Stewart
- The Edgar & Ellen series by Charles Ogden
- The Tower Treasure by Leslie McFarlane
- The Secret of the Haunted Mirror by Carolyn Keene
- The Case of the Golden Key by John R. Erickson
- The Secret of the Wooden Lady by Carolyn Keene
- The Case of the Stolen Sixpence by Holly Webb
- The Secret of the Red Arrow by Franklin W. Dixon
- The Mystery of the Hidden Beach by Carolyn Keene
These books offer engaging stories with intriguing mysteries and puzzles for kids to solve, encouraging them to think critically and use their imagination.