Laura is the target of an assassination attempt and the management of the pharmaceutical company is entangled in a tangle. Karppi and Nurmi find their way to the hideout used by the murderer and at the same time access the traces of the symbol seen in connection with the bodies. The dual role takes Henna deeper into the underworld.

Karppi, wanted by police, continues to investigate on his own and encounters a disguised murderer. Henna, at the mercy of criminals, has to face death in the eyes. The grass helps Carp get rid of doubts.