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.
You can read the story here (PDF).
Edit 2020-06-03: This story has been thoroughly reworked in 2020. Stay tuned for news and an updated version.