The death of a customs officer at Stuttgart Airport puts inspectors Lannert and Bootz on the trail of international arms smuggler Viktor de Man. Lannert knows the man: It's the one he worked on as an undercover agent for four years. Shortly before the arrest, Lannert was tragically exposed. Now he really wants to convict the man. What he couldn't do on his own, he can now do with his team, especially with his partner Bootz.