When ZERV officers find a large cache of banned weapons in the decommissioned NVA military site, Simon and Karo presume that Trockland may have been killed because he was pursuing the illegal NVA arms trade.

Böttcher's death confirms that Simon and Karo are on the right path. At his funeral, they identify a person of interest known as `KoKo-Wutzke', Gärster's former boss, and a man from Karo's complicated past.

Böttcher's death forces a distraught Gärster to turn himself in; in ZERV custody, Simon makes an unauthorised deal with Gärster without the knowledge of his boss; Karo makes a shocking discovery about her father.