The corpse of Lübbers, the marzipan maker from Lübeck, has been found. The craftsman has choked on a bar of his own marzipan. Finn and his partner Sandra, a down-to-earth woman and a bit of a hypochondriac, begin to investigate.
Klara finds the body of a man in the old town of Lübeck, it's a murdered student whom her roommates describe as a philanderer with financial problems. Research reveals that he had an affair with one of the neighbors, but another of his lovers is also suspicious. Finn will also focus on the ex-husband of one of them, an ambitious and conservative politician with a weak alibi.
The young Philip Ahrens, son of a distinguished Lübeck business family, has been pierced with a spear in front of his brother's house. Later, when Finn arrives at the crime scene, the young man is already dead. Finally, the starting point for the investigation is the spear, which comes from the Katharineum High School gymnasium, where Philip trained students for the annual pentathlon.
The body of a man has been found in a parking near the forest, he was a hit-man and debt collector called the Hulk, a police's old well known, seems he has been attacked but Finn and Sandra will try to discover what he was doing in Lübeck.
After years in NY Marie returns to Lübeck, former classmate of Finn's aunts they want to resume contact but Marie appears dead. There was a rumor that Marie had become pregnant at 16 and her parents sent her to the USA to hide the scandal.
While playing soccer in the park, young Azubi Orkun discovers the body of a woman. This is Ilona Stamm, a woman quite famous in the region for her 40-centimeter nails. Curiously, she died when she had nail scissors stuck in her ear. During the investigation, Finn, Schroeter and Schwartenbeck meet Hella Knesebeck, the victim's twin sister, who suffers from heart disease. Even though she lived in the same house as her sister, she does not have positive words for the victim.
Someone harpooned Horst Flens, the caretaker of the Lübeck aquarium, and left him seriously injured. In addition, the attacker has kidnapped Otto, a very valuable puffer fish that is the pet and star of the aquarium, and has left an extortion note. Later, while the victim is in the hospital in a coma, Finn Kiesewetter and his team begin the investigation by questioning the caregiver's colleagues.
A famous singer is murdered with a diamond thread that cut off his head while sailing the canal; investigation reveals the attack was directed at someone who sails there regularly: a captain who makes tourist trips annoying the neighbors.
The secretary of a publisher erotic literature comes across the murdered body of her boss, Finn finds a crumpled page from the manuscript of the Didier Moretti's new erotic novel in the victim's mouth, that fact makes him the main suspect.
In the industrial area near the port of Lübeck they find the body of the actor Roland Freesmann. Everything indicates that an all-terrain vehicle ran over him when he was leaving a rehearsal and he was still wearing the Indian costume. Later, Finn Kiesewetter and Sandra Schwartenbeck believe they have found the culprit. Finally, Strahl, the coroner, finds a bullet in Freesmann's back, revealing that he was actually shot during the theater rehearsal without him realizing it at the time.
A perfumer dies after smoking a cigar, it doesn't seem like a homicide but Sandra suspects of a poisoning; the family doctor and old friend of the victim, diagnoses a heart attack but the coroner confirms Schwartenbeck's suspicion.
While Ria and Toni, Finn Kiesewetter's aunts, close the shop and go on vacation, Finn's investigation team has a lot of work ahead of them: Falk Büsing, an ornithology fanatic, has been found dead in his house hit by the statue of a bird. Furthermore, the victim's little brother, Georg Büsing, who lives in the same house, is the one who found the body and it is he who assures Finn and Schwartenbeck that Falk had many enemies.
A healer is found tied up and murdered in his home. Finn and Sandra discover that he had scammed many patients with his dubious methods. Victim's assistant who was having an affair with him tells nothing but lies although she has an alibi.
They run over a traffic cop and appears two suspects in a dispute over an old RR, apparently they hit him with this car but both have an alibi. Victim's wife seems unfazed and Schröeter discovers that she had been accused of stealing cars.
