Emil suspects that the attack on the siblings may have a connection to his crown witness. Gustav, Nina and Linus try to find out who is responsible and finally they get a clue. But what they don't know is that someone else is one step ahead.

The only way to try to eliminate the threat seems to be to appease the perpetrator. Emil succeeds in finding out the identity of the perpetrator, but during the operation for the arrest, something else catches his attention.