Commissioners Neuhaus and Gillot are supposed to investigate two deaths. A man suddenly dies at home and a young man dies from his crossbow. Foreign influence? This death is very close to the detectives' minds.

On the run with a hammer: Inspector Jung and her boss Enders pursue a perpetrator in Mainz's old town. Back at the station things get difficult: a rioting prisoner screams like he's out of his mind.

Funny costumes and lots of alcohol. The Old Town Guard has a lot to do during Carnival in Mainz. Does the llama go for walks with his own garbage can or is it stolen? Police Commissioner Jung investigates the matter.

Inspectors Udo Hotz and Omar Meftah from the Heidesheim motorway station have just confiscated a driver's license when they are called to an exciting chase.

Brawl in front of a club: Commissioner Katharina Klüpfel and Michael Kirch are called to a club. They resolve the argument among several drunk and aggressive men, but suddenly the mood changes...

A lot to do that night: The search for a stalker is underway, a young drug victim is being examined and a confused man is crouching aimlessly under a lamppost while a car rushes into the tram tracks.

A turbulent night in Mainz: Alcohol and riots determine the police operations. In front of a nightclub, the old town guard has to mediate between bouncers and a very drunk guest. And the KDD is called to a body found at a bus stop.

Nighttime search operation for the Mainz Old Town Guard: Will they find the boy in time who announced his suicide after an argument? Meanwhile, the criminal investigation service makes a grisly discovery: a badly decomposed corpse in a house completely littered with rubbish.

An alarming radio message reaches the Old Town Guard team. Shots are said to have been fired in a Mainz residential area in the middle of the night. To protect themselves, the officers have a dog with them, which could more easily overpower an armed perpetrator.

The highway police have to secure an accident scene in the middle of the night. A deer lies run over on the road. The situation is risky, also because a car is racing towards the officers without braking. The old town guard is also called to a dangerous mission: a robbery with several people injured.

The KDD is called to a break-in in downtown Mainz. The victim is missing a weapon. He knows the alleged perpetrator and suspects that he is planning further attacks. Meanwhile, in the city center, a motorcycle gang is making the streets unsafe, and the Old Town Guard is in pursuit.

A restless night for the KDD: First the investigative team is called to an armed robbery at a gas station, then a break-in at a scrapyard is reported. They find a suspicious car near the crime scene and discover several bolt cutters in the trunk.