Originally a mathematician, Gerhardsen worked as an IT-consultant before becoming a full-time writer. Her mathematical knowledge is visible in her novels, which contain advanced calculated intrigues. Her popular book series The Hammarby Series, circles around Detective Inspector Conny Sjöberg and his team solving cruel and brutal murders in the southern parts of Stockholm. In 2012 her first novel in the series The Gingerbread House was released in America by the publishing house Stockholm Text.
- (1992) På flykt undan tiden
- (2008) Pepparkakshuset; English translation: The Gingerbread House (2012)
- (2008) Mamma, pappa, barn; English translation: Cinderella Girl (2013)
- (2010) Vyssan lull
- (2011) Helgonet
- (2012) Gideons ring
- (2013) Hennes iskalla ögon
- (2014) Tjockare än vatten
- (2015) Falleri Fallera Falleralla
- (2021) Black Ice
- Redvall, Eva (25 January 2008). "IT-konsulten blev deckarförfattare". Sydsvenskan. Archived from the original on 18 April 2013. Retrieved 14 June 2012.
- Forshaw, Barry, Death in a Cold Climate, Palgrave Macmillan 2012
- "Black Ice". Penzler Publishers. 2021-06-09. Retrieved 2021-06-09.