- Freelance writer since 2001. (2004)
- The first volume of the Raid book series written by Nykänen was published in 1992, and a total of 12 novels have been published.
- The film Raid is based on his work.
- In addition to Raid, Nykänen has written dozens of other detective stories.
- In addition to his work as a writer, Nykänen also worked as a publisher and he is the founder of CrimeTime publishing house and Pulitzer Oy.
- Nykänen was one of Finland's most famous crime writers, who also had a long career as a crime journalist.
- His autobiographical works Likainen Harri: 20 years as Erko's ring was published in 2015.
- Nykänen was awarded the Lead of the Year Award by the Finnish Detective Society in 1990 and 2001.
- In 1994, Nykänen was awarded the Lumilapio prize for investigative journalism after reporting on the corruption of the police leadership.
- He also won the Snow Spade in 2001 together Vellamo Vehkakoski with about the article about workplace harassment.
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