Cathrine Delors is an employee of Interpol in France. She is supposed to help Semir and Tom solve the murder of Frank Schwarz. He was involved in drug dealing in Marseille together with the gangsters Hofmann, Cramberg and Laubner. All four gangsters were originally supposed to testify together against the notorious 'Godfather of Marseille' in Germany. But he seems to have gotten wind of it and hired a killer. Schwarz was victim number one. The Cobra team must now track down the remaining three drug dealers with the help of Cathrine Delors before the killer does. During the investigation, Tom falls in love with Cathrine Delors, without realizing that she is actually the professional killer hired... (thetvdb.com)