Dette er den femte boka i serien om Pelle og Proffen. En dag blir tanta til Proffen slått ned på åpen gate. Men gjerningsmennene stjeler ingenting. Da Pelle og Proffen besøker henne på sykehuset, oppdager de imidlertid at det er malt et stort, blått kryss på ryggen av kåpa hennes. Senere får hun tilsendt en stor bukett roser, og med dem følger et kort der hendelsen beklages. Kortet er underskrevet "De blå ulvene". Flere kvinner kommer utfor nøyaktig det samme. Pelle og Proffen tar saken for å finne ut hvem som står bak dette, og hvorfor ingenting blir stjålet.
This is a dual ISBN first edition with one additional ISBN for the book club Ungdomsbokklubben. The publisher, Cappelen's, ISBN is 8202131596.
Ingvar Even Ambjørnsen-Haefs (1956-2025) was a Norwegian writer. He is best known for his "Elling" tetralogy: Utsikt til paradiset (1993), Fugledansen (1995), Brødre i blodet (1996), and Elsk meg i morgen (1999).
Brødre i blodet ("Blood brothers") was turned into a successful movie, entitled Elling, which received an Oscar nomination in the Best Foreign Film category in 2001. The English translation of the novel is called Beyond the Great Indoors.
His debut novel was a semi-autobiography called 23-salen ("The 23rd Row"), in which he criticized Norway's efforts to take care of psychically challenged individuals. In all his novels he has spoken the outsiders' cause, as he did in his break-through novel Hvite Niggere ("White Niggers") in 1986. The novel is about a young man who leads a life somewhat on the edges of normal society.
He is also known for the youth's book series "Pelle og Proffen" which circles around two detective teenagers, getting involved in all kinds of mysteries or crimes involving drugs, pollution and neo-Nazism among other things. He started this project after having read some of Franklin W. Dixon's books about The Hardy Boys. The books Døden på Oslo S, Giftige Løgner, and De Blå Ulvene of this series were also turned into successful movies. In 2005 the book Drapene i Barkvik ("The murders in Barkvik") appeared, about the teenager Fillip Moberg attempting to solve an axe murder in a small Norwegian village.
Ambjørnsen has received many prizes for his writing. Among them is the prize for the 80s best book for children and young adults (Pelle and Proffen books), the Tabu prize in 2001, Telenor Culture Award 2002, and the Brage Prize 1995.
His three Samson and Roberto books have become particularly popular in Russia, in part due to the illustrations by Nikolai Vorontsov, which also contribute carefully orchestrated local Russian-related colloquialisms to the stories.