I highly recommand you to see books written by Enid Blyton and Roald Dahl.
Books by Enid Byton:
The Famous Five series
The Secret Seven series
The Naughtiest Girl series
Books by Ronald Dahl:
James and the Giant Peach
Charlie and the Chocolate Factory
The Witches
Matilda
The BFG
Danny, the Champion of the World
These are the books and series which I think might be suitable for you.