Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.

Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.

Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.

Lynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.

Lynn and Arne assemble the servants to review the clues and sniff out the killers through deductive reasoning.