Adventure and mystery book series by Swedish author Patrik Bergström.
Each volume is fully illustrated, and I have created roughly 30 color illustrations, plus a map and the cover.
Books in the series
Title: Mysterieklubben och det hemliga rummet
Author: Patrik Bergström
Publisher: Lilla Piratförlaget, 2019
All illustrations © Filippo Vanzo
Book design by Niklas Lindblad, Mystical Garden Design.
* in Swedish only