Astrid and Amir. The Secret Code Mystery

The books of the famous Swedish writer Charlotte Lannebu are well-known in many countries. Her heroes are ordinary boys and girls, about whom the writer knows everything. Therefore, the stories she creates are always very believable and exciting.
In this book, Astrid is already in third grade. At the beginning of the school year, Amir, a new student, joins the class. He has conceived a plan to create an agency for identifying spies and offered Astrid to be his partner. Astrid immediately agrees. She is sure that they are in for extraordinary adventures!