However, some of her books have been adapted into TV series and films:
* The Eagle and the Owl (2002): A Finnish TV series based on the first book in Lehtolainen's Detective Maria Kallio series.
* The Midnight Sun (2009): A Finnish TV series based on the second book in Lehtolainen's Detective Maria Kallio series.
* The Shadow of the Raven (2014): A Finnish film based on Lehtolainen's novel of the same name.
* The Last Witness (2022): A Finnish TV series based on Lehtolainen's novel of the same name.
These projects have not been released internationally, but they are popular in Finland and give a glimpse into the world of Lehtolainen's mystery novels.