Häräntappoase was made into a six-part television series and stage productions in Turku and Kotka and summer 2010 in Pyynikin kesäteatteri in Tampere.

In 2001, she published Heikosti positiivinen (Weakly Positive), which focuses on motherhood, and in 2005, Loppuunkäsitelty (Finalized), which addresses her sister Killi’s suicide.

In 2014, Härkönen released Takana puhumisen taito (The Art of Talking Behind Someone’s Back), a campaign book published by the Finnish Booksellers Association.

[2][5] Härkönen gained public recognition as an actress through Mikko Niskanen's film Mona ja palavan rakkauden aika (1983), in which she played a young high school girl who discovers Jesus.

In 1988, Härkönen starred in the title role of the television film based on Minna Canth's play Anna Liisa, directed by Tuija-Maija Niskanen.