Reading age: 7 - 9 years old. 
 
Julian to the rescue!

Grown-ups aren’t very good at solving crimes. That’s why it’s time for Julian, Huey and Gloria to take matters into their own hands.

The crime-busting kids go on a mission to track down wanted criminals. They have a special motto, a secret code and plenty of plans. All they need now is their first crook . . .