The Marnow Murders: The Five-Star German Crime Thriller Where One Murder Opens a Far Darker Case

A man is discovered hanging upside down in his apartment. What first appears to be a baffling murder soon draws two detectives into a web of killings, corruption and secrets that powerful people are desperate to protect.

That is the disturbing premise of The Marnow Murders, the acclaimed German crime drama available through Channel 4’s Walter Presents collection. Set in Schwerin, a lakeside city in northeastern Germany, the series combines unsettling murder investigations with complex characters and a conspiracy that reaches beyond the crime scenes.

The first series arrived on Channel 4 in 2023, introducing viewers to detectives Lona Mendt and Frank Elling, whose contrasting personalities make them an unusual but compelling investigative partnership. The drama has since gained attention for its atmospheric storytelling, unpredictable cases and gradually unfolding secrets.

Now, the second series brings another mystery, moving from the oppressive heat of summer to the bitter cold of winter. With a missing 12-year-old girl, a human trafficking investigation and evidence that appears to have been deliberately erased, the stakes are higher than ever.

For viewers who enjoy layered European crime dramas and the twists associated with Harlan Coben adaptations, The Marnow Murders offers a mystery that extends well beyond the question of who committed each killing.

What Is The Marnow Murders About?

The first series takes place during an exceptionally hot summer in Schwerin, where detectives are confronted with a string of disturbing murders. The investigation begins with the discovery of Alexander Beck, who is found hanging upside down in his apartment.

At first, the killings appear unrelated. As the detectives examine the evidence, however, they begin to suspect that the apparent randomness conceals a much larger pattern.

Leading the investigation are Lona Mendt, played by Petra Schmidt-Schaller, and Frank Elling, portrayed by Sascha Alexander Geršak. Their personalities could hardly be more different, but both bring qualities that prove important as the case becomes increasingly complicated.

Lona is independent, reserved and emotionally guarded. Frank, by contrast, is a devoted family man whose home life provides a sharp contrast to his partner’s more solitary existence. Their differences create tension, but they also make their partnership an important part of the drama.

With help from junior detective Sören Jasper, played by Anton Rubtsov, they pursue connections between the killings. Their investigation soon attracts unwanted attention from people with links to East Germany who are determined to prevent the truth from emerging.

The pressure also comes from within law enforcement. Federal Police Investigator Bernd Peters, played by Jörg Schüttauf, works against Lona and Frank, attempting to stop their inquiry.

As the detectives get closer to the truth, the case becomes a dangerous test of their instincts and judgment. They must determine who can be trusted while confronting the possibility that the murders are connected to secrets someone is willing to kill to protect.

The series uses this expanding investigation to build suspense gradually, allowing apparently disconnected events to take on new meaning as the story progresses.

What Happens in The Marnow Murders Season 2?

The second series introduces a new investigation with even more disturbing implications. Set during a bitterly cold winter, the story centres on human trafficking, brutal murders and a network of people determined to conceal their activities.

Lona and Frank investigate a complicated case that leads them to a 12-year-old Bulgarian orphan named Sarah. Their efforts to protect her take a devastating turn when a witness protection operation goes wrong. Both detectives are shot and left in comas, while Sarah disappears without a trace.

With the original investigators unable to continue, two specialist detectives take over: Maja Kaminski, played by Sabrina Amali, and Hagen Dudek, portrayed by Bernhard Conrad.

They inherit a case in which crucial files have mysteriously vanished. As they try to reconstruct what happened, they must also investigate a possible breach of a secret safe house and determine who may have betrayed the operation.

Dudek has a hidden agenda of his own, adding another layer of uncertainty to an investigation already filled with compromised evidence and conflicting motives.

The season unfolds through two parallel storylines, gradually revealing the events that led to the present-day crisis. As the connections between the characters become clearer, the detectives face an increasingly urgent question: who is responsible for the violence, and can Sarah be found before it is too late?

The combination of a missing child, human trafficking, unexplained evidence tampering and a potentially compromised investigation gives the second season a broader scope while preserving the unsettling atmosphere of the original.

Who Stars in The Marnow Murders?

The German drama features an ensemble cast, with returning performers alongside new characters who become central to the second investigation.

The principal cast includes:

• Petra Schmidt-Schaller (Ein Schritt zum Abgrund) as Lona Mendt
• Sascha Alexander Geršak (Nothing Bad Can Happen) as Frank Elling
• Anton Rubtsov (Boom Boom Bruno) as Sören Jasper
• Jörg Schüttauf as Bernd Peters
• Minh-Khai Phan-Thi (Doppelhaushälfte) as Bettina Meier
• Peter Kremer (Siska) as Norbert Böhm
• Victoria Trauttmansdorff (Counterpart) as Dr. Iris Fichte
• Anne Schäfer (Barcelona Crime) as Susanne Elling
• Bianca Nawrath (Lost in Fuseta) as Mareike Elling
• Christine Schorn as Helga Elling
• Michael Mendl as Klaus-Dieter Turn
• Lutz Blochberger as Michael Bender
• Judith Engel (Casting) as Frauke Bender

The second season also introduces Sabrina Amali as Maja Kaminski and Bernhard Conrad as Hagen Dudek, the specialist investigators tasked with taking over after Lona and Frank are attacked.

Their arrival changes the dynamic of the story. Instead of simply continuing the original detectives’ work, they must reconstruct a compromised investigation from incomplete records while confronting the possibility that someone involved knows far more than they are willing to admit.

The contrast between the returning characters and the new investigators helps sustain the mystery as the series explores different perspectives on the same dangerous case.

Is The Marnow Murders Worth Watching?

For fans of dark, character-driven crime dramas, The Marnow Murders offers more than a succession of murder cases.

Its strongest feature is the way individual crimes gradually become part of a wider mystery. Details that initially seem unrelated acquire new significance as the investigation develops, while corruption and attempts to suppress the truth repeatedly complicate the detectives’ search for answers.

The central partnership between Lona and Frank also gives the first series a compelling human dimension. Their differences create friction, but their personal vulnerabilities make them more than conventional television detectives.

The second season builds on that foundation with a more expansive conspiracy involving human trafficking, missing evidence and the disappearance of a vulnerable child. The two parallel storylines encourage viewers to pay attention to the details rather than expect every question to be answered immediately.

The drama’s bleak atmosphere and disturbing subject matter will not suit everyone, but viewers who enjoy intricate European mysteries may find its layered storytelling particularly rewarding. Its emphasis on hidden connections and compromised authority should also appeal to those who like trying to piece together a case before the investigators do.

Overall, The Marnow Murders is a strong choice for viewers seeking a crime drama that combines suspense with complicated characters and a mystery that reaches far beyond its opening murder.

How to Watch The Marnow Murders

The first series is available through Channel 4’s Walter Presents collection. The supplied article lists the second series as arriving on Channel 4’s streaming platform on Friday, 26 June.

The second season originally aired in Germany in 2024 under the title Finsteres Herz – Die Toten von Marnow 2. It comprises six episodes, while the original series consists of eight.

If you have not watched the drama before, starting with the first series will introduce you to Lona and Frank’s partnership and the forces that make their investigations so dangerous.

What Other Detective Dramas Should You Watch?

If The Marnow Murders leaves you wanting another dark mystery, these two series are worth adding to your watchlist.

Irvine Welsh’s Crime

Set in Edinburgh, Irvine Welsh’s Crime stars Dougray Scott as Detective Inspector Ray Lennox, who investigates disturbing cases while struggling with personal demons of his own.

The series combines gritty police work with an examination of the emotional pressures facing its central detective. Its focus on flawed characters and difficult investigations makes it a good option for viewers who prefer crime dramas that explore the people behind the cases.

The series is available to stream on ITVX.

Hellground

Another German crime drama available through Walter Presents is Hellground.

The story follows Dr. Fabian Lambert, played by August Wittgenstein, who moves to a quiet village in Germany’s Black Forest. His arrival coincides with a series of mysterious murders, raising questions about whether the crimes are connected to his presence.

Its secluded setting and unfolding mystery offer a different take on the atmospheric European detective drama.

All episodes are available to watch on Channel 4.

Whether you prefer the tangled investigations of The Marnow Murders, the personal struggles at the heart of Irvine Welsh’s Crime or the unsettling village mystery of Hellground, there are plenty of options for your next crime-drama binge.