When Matthias Trockland, who turned witness for ZERV, is found dead, ZERV West Commissioner Peter Simon and Karo Schubert from the Berlin homicide squad work together to solve the mystery surrounding Trockland's death.

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.

Reiko Böttcher is arrested as a suspect in the arms theft and the explosion at the NVA site. Reiko makes a startling confession, which helps Simon and Karo get a step closer to the truth, but he also ends up risking his life in the process.