I will find the key

Private investigator Julia Stark receives an unannounced visit at the office. The man at the door is one of the owners of a successful family business. The day before, he was present at a board meeting and dinner at his estate in the northwestern part of Sweden. The following morning, he finds a photograph in his phone of a bloody man, tied up with a bag over his head. The man has no idea where the picture comes from and wants to hire Stark Detective Agency to clear his name before the police get involved.