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10 Episodes 2019 - 2019
Episode 1
50 mins
Balthazar is over the moon after captain Bach landed in his bed, oblivious of their nocturnal orgy until he assures he having remained a perfect gentleman. Called to the site of a fatally stabbed dog, he finds it is covered in blood, but mainly human. Searching the area yields a corpse and a live baby boy, hidden in a dumpster. The team must solve the past of the parents and vindictive babysitter who used a fake identity.
Episode 2
53 mins
A collection of bones found in an old abandoned building yields 3 bodies dating back to the Middle Ages and one who died a week ago, partially dissolved in acid

Episode 3
51 mins
Raphaël is as amused as Bach embarrassed after she got drunk, danced on the table and ended nude in his bed, but he remained the perfect gentleman. The ingrate acts aloof and jumps in bed with the first healthy man they pass on mission to an Alpine resort, on the trail of the presumed copycat who murdered in the MO of a jailed serial killer. They collaborate with the town's mayor and gendarmerie (military state police) captain Perbet, who prove involved in a mass conspiracy as Balthazar's smart searching piles up hidden evidence of several crimes. Meanwhile his forensic assistants Jérôme and Fatimdo a poor job covering up the party he dutifully forbade, as expected. Raphael is rewarded with Bach's support to reopen his wife's killer's case, but it's he who swings the judge himself by offering free medical help.

Episode 4
47 mins
When a woman is found hanged from a bridge it appears to be straightforward suicide, but Balthazar finds it strange that another victim died the same way days earlier..
Episode 5
54 mins
Rafael cheerfully examines a waiters' corpse in a derelict toy store with rookie detective lieutenant Nadjet Elourmi, whom he reassures pretending there'e excellent modern therapy after discovering they're both infected with bubonic plague. He informs the NRBC (French CDC) to install maximal isolation, which Bach irrationally insists to break 'to question Raf'. Nadjet dies, forensic medicine apprentices Eddy and Fatim treat their mentor inside, seemingly to no end by the book, so Eddy decides to go a step further then the risky treatment by fever Balthazar invented as a hail Mary, risking his career. Raf's clues and memory help Delgado and Bach identify the mad lab scientist who exacts deadly revenge for a student hazing incident, in time to prevent a next victim exposure.
Episode 6
49 mins
After hearing an emergency call from a distressed teenager, Bach arrives at a peculiar crime scene: an empty car with smashed windows and a trunk full of snakes.
Episode 7
49 mins
The police is deeply worried as the arrow-murder of a person in Snow White costume starts off a series of weird murders around Paris. Balthazar helps work out the victims have been hunted down as part of as sadistic real man hunt game, organized periodically. They work out which website recruits people to stake their lives as only one surviving contestant gets a hefty sum. As time runs out before a judge can sign a warrant and a policeman put through procedure, Balthazar volunteers himself. He and a penniless man are knocked out for transport to castle grounds, where they must run from their and his fellow contestant tries to turn on him, yet he rescues the desperate fool.

Episode 8
51 mins
Devastated by the failure of their investigation, Balthazar and the detectives try to focus on the deaths of three teenagers murdered while camping.
Episode 9
49 mins
Lt Bach's former boss and mentor Cat Meyer is in town to give evidence at the trial of a young man accused of killing his sister. When Cat is found stabbed to death in the woods, Bach has step in but quickly discovers something is very wrong with the case.

Episode 10
46 mins
When the Lise's killer sends Balthazar a video of his latest murder, Balthazar relies on drugs to numb the pain and starts to lose his grip on reality.