Die Dame aus Berlin

I recently bought a copy of Die Dame aus Berlin by Frank and Vautrin. The book is in German. The eBay seller said it had something to do with Louise Brooks. And in fact, she is mentioned on the back, "ratselhaft wie die Garbo, klug wie Louise Brooks, fatal wie die Dietrich." (Norma Shearer is on the cover.) Is anyone familar with this book? Has anyone read it? It is fiction, I assume. According to the copyright page, it was originally published in Paris in 1987 under the title Les Adventures de Boro, reporter photographe. Here is a link to the amazon.de page on this title, as well as the amazon.fr page. Any information would be appreciated.