3 books · Ages 5–9 · Chapter Books
Scooby-Doo! and Krypto Mysteries is a 3-book series for ages 5–9 by Michael Anthony Steele. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, The Mini Mystery and Trouble on the Double are great first picks.
No particular order needed — browse and pick what catches your eye.