After the attempt on his life, Andreas wants to quit his job at the State Criminal Police Office. But Mick convinces him that he can only protect himself and his family if they solve Koller's death. During his unofficial investigations, Mick comes across a blackmail email involving millions of dollars and a major incident that took place in 2002. But who sent the email? And a file documenting precisely this period is missing from the archives...

Mick gains access to a restricted LKA file containing a list of people who were involved in the big heist on New Year's Eve 2001/2002. There is a blacked-out name with seven letters on the list! It is now clear to Mick that the perpetrator must be from the police, the State Criminal Police Office, or the security company. Investigations at the security company reveal that his father worked there at the time. And the name Brisgau has seven letters...