Season 1
Episode: 1x01 | Airdate: Mar 8, 2014
A young woman's body is found on the banks of the River Rhine. Is there a connection to three murder victims who were killed four years earlier? DI Helen Dorn and Dusseldorf CID attempt to find out.
Episode: 1x02 | Airdate: Sep 24, 2014
When the four-year-old daughter of a wealthy businessman disappears under mysterious circumstances, a kidnapping seems likely. Why is the child's father so determined to find her without police help?
Episode: 1x03 | Airdate: Jan 24, 2015
A young policewoman is shot dead and her partner - an accomplished marksman who is in the power of a blackmailer - disappears, taking his daughter with him. Is he behind her death and on the run?
Episode: 1x04 | Airdate: Nov 7, 2015
A convicted sex offender who was acquitted following an appeal is found hanged in a factory building. When the liberal judge responsible for his release is also found dead, foul play is suspected.
Episode: 1x05 | Airdate: Mar 5, 2016
When a bomb explodes in a busy square, responsibility for the terrorist attack is claimed in an online video, and the supposed perpetrator is shot dead. But Helen isn't sure it's such a simple case.
Season 2
Episode: 2x01 | Airdate: Nov 26, 2016
A man is found murdered in an airport toilet carrying false documents suggesting he was part of a witness protection programme, and it seems he had been the bookkeeper for an organised crime ring.
Episode: 2x02 | Airdate: Jan 28, 2017
A judge in the juvenile court system who is famous for his harsh rulings becomes the target of hate mail and threats. Unconcerned, he refuses police protection, but an arson attack raises the stakes.
Episode: 2x03 | Airdate: Apr 8, 2017
Helen must use all her strength to protect two siblings - orphaned 17-year-old Mila and her 11-year-old sister Hannah - who are caught in the crossfire between two predatory and dangerous criminals.
Episode: 2x04 | Airdate: Mar 17, 2018
The lawyer Johannes Trautwein disappears on the way to his golf club. Soon the suspicion that he was killed is confirmed. He allegedly had ample evidence that would have exonerated a client.
Episode: 2x05 | Airdate: Dec 1, 2018
Helen Dorn is in crisis: her dramatic chase after a criminal ends with two dead - and a bullet in her chest.
Season 3
Episode: 3x01 | Airdate: Feb 9, 2019
A small village in the Bergisches Land - after a village festival, Karla Petersen, a young woman, is murdered on the way home. Helen Dorn, whose father is still in a coma, takes on the case.
Episode: 3x02 | Airdate: Jan 25, 2020
Helen Dorn herself becomes a case for the police when she is accused of the murder of her boss Mattheisen. A surveillance for illegal arms trafficking gets out of hand.
Episode: 3x03 | Airdate: Oct 24, 2020
Chief Inspector Helen Dorn is still feeling the effects of the murder of her boss Mattheisen. A new case leads them from North Rhine-Westphalia to Hamburg.
Episode: 3x04 | Airdate: Mar 6, 2021
The Hamburger Summer Fair: fairground rides, flashing lights, funfair music. At the edge of the cathedral, the rescue team Holger Krawitz and colleague Petra Winkler routinely walk.
Episode: 3x05 | Airdate: Sep 4, 2021
After a colleague shot himself in front of her, Helen Dorn is confronted with her feelings of guilt and the silent reproaches of her colleagues, above all Tayfun Murat.
Season 4
Episode: 4x01 | Airdate: Mar 12, 2022
An arson attack resulting in death leads Helen Dorn into the left-wing extremist scene. The Autonomen have long had their sights on Ralph Wagner, a wealthy real estate agent
Episode: 4x02 | Airdate: Feb 11, 2023
Rolf Kanther, head of a medium-sized company that manufactures military technology, is shot from a great distance while hunting on his hide, next to his daughter Sonja Kanther.