The Gang of Four 3 - A Mystery in Sintra

The Famous Five 4 - A Secret in the Cellar

The Famous Five 16 - Five Go to Smuggler's Top

The Gang of Four 25 - The terrible secret

Gang of Four 29 - The mystery of the Tombo tower

Conspiracy 365 - July

By the lake of enchantments

The Bronze Boy

The tree

Espionage - Juvenile Knowledge Library

I want to be an aviator - Active Library 6