The Kreuzberg File is a cross between a thriller and a mystery. The action takes place in the recent past. The central character is the private investigator Bill McDonald, who works for a law firm in New York. Because of his knowledge of German, he is sent to Berlin when an important file, seemingly the property of his firm's major client, is missing. The reader follows Bill's perilous search for the missing file, which begins in Berlin and leads him to Frankfurt, Düsseldorf and Hamburg. Deadly violence becomes a regular part of his pursuit because a criminal organization is also looking for the data of innovative medical research contained in the file. What seems initially to be a straightforward job turns into a frustrating task because Bill finds out that he was never given the complete information about his case. There are moments when it is not even sure whether the file actually exists. Bill's situation becomes very more tenuous when he realizes that he cannot fully trust his own employer. Against all odds, he succeeds to recover the file and can return it to its rightful owner, a small start-up in Berlin that did the original research.