In 2012 Tommi Salminen got an inspiration to write a short story for children who have just learned to read. The story is an exciting adventure that involves following clues and unraveling a mystery in a familiar neighborhood. The readers can also try to decipher a code that is puzzling the characters.
This piece is written in Finnish. The title is “Riku, Taavi ja Heidi – Syntymäpäiväseikkailu”, which implies that there could be more stories to come with the same characters if some publisher shows interest in it. The story was thoroughly reworked in 2020.
You can read the story here (PDF).