Jo Nesbø (Norwegian: [ˈjuː ˈnɛsbøː]; born 29 March 1960) is a Norwegian writer, musician, and former economist and reporter. As of March 2019, more than 3 million copies of his novels have been sold in Norway, and his work has been translated into over 40 languages, selling 33 million copies worldwide.
Known primarily for his crime novels featuring Inspector Harry Hole, Nesbø is also the main vocalist and songwriter for the Norwegian rock band Di Derre. In 2007 he released his first children's book, Doktor Proktors Prompepulver (English translation: Doctor Proctor's Fart Powder). The 2011 film Headhunters is based on Nesbø's novel, Hodejegerne (The Headhunters).
I denne anden bog er der dømt eventyrlig historieundervisning, da Lise og Bulle modtager et mystisk brev fra Doktor Proktor, som er forsvundet på en tidsrejse.
Lise og Bulle må rejse tilbage i tiden, nærmere bestemt til Paris år 1969, for at redde Doktor Proktor, der er blevet fanget af den onde Claude Cliché. Men eventyret slutter ikke der. De må helt tilbage til den franske revolutionstid og forandre historiens gang.