E1 · Those Who Dig Pits for Others Will Fall In Themselves
Louis Hartmann joins forces with the members of the Arne Detective Agency to investigate his father's murder.
E2 · There Is Always Sunshine After the Rain
Lynn remembers the time she first met Arne and hired him to help investigate her father's suspicious behavior.
E3 · Misfortune Never Visits Alone
Arne makes a shocking discovery about Lynn's father and Gordon reveals the dark truth of the Reinweiß mansion.
E4 · Those Who Never Gamble Never Win
Lynn and Arne are both troubled by surprise encounters that threaten to alter the course of the investigation.
E5 · One Swallow Does Not a Summer Make!
Lynn and Arne assemble the servants to review the clues and sniff out the killers through deductive reasoning.
E6 · Time Will Tell
A distraught mermaid arrives at the detective agency searching for the reason why her lover tried to kill her.
E7 · Eating Whets the Appetite
Arne tracks down a jewel thief while Lynn investigates a series of disappearances connected to an art museum.
E8 · Desire and Love Make All Burdens Lighter
Lynn and Arne trace the mysteries of the missing men and lost piece of jewelry to their shocking conclusions.
E9 · Not All That Glitters Is Gold
Arne and Lynn are asked to investigate a man who appears to have started cheating on his wife after an injury.
E10 · Different Countries, Different Customs
Arne decides to investigate a locked-room murder on a whim and soon realizes that it may not be what it seems.
E11 · Birds of a Feather Flock Together
Arne uncovers a disturbing connection between all five of the cases investigated by the Arne Detective Agency.
E12 · Episode 12
