2 books · Ages 8–17 · Young Adult
The Three Investigators is a 2-book series for ages 8–17 by Robert Arthur. Each book stands alone — start anywhere.
Where to Start
Start anywhere — each book stands alone.
That said, The Secret of Terror Castle and The Mystery of the Manichean Mask are great first picks.
All Books
No particular order needed — browse and pick what catches your eye.
