Two homicide detectives - one from Austria, the other from Germany - join forces to investigate dark and mysterious cases amidst the picturesque backdrop of Lake Constance.
As the dead body of a woman is found in a hops field, hanging in a spider web on a seven-meter-high scaffold, a chilling suspicion grips Detectives Oberländer and Zeiler - everything points to a serial killer.
A woman's body is discovered dressed as a mermaid on the shores of Lake Constance. Detectives Oberländer and Zeiler investigate a group of surfers and the victim's ex-husband as suspects.
A long forgotten curse seems to resurface when children witness a murder in an old and deteriorated mansion. Detectives Zeiler and Oberländer need to investigate the past in order to uncover the truth.
When a baby is found floating inside a wicker basket on the lake, Oberländer and Zeiler suspect a connection to an older case of a missing woman. The strange symbols painted on the sheets the baby was wrapped in give them their first lead.
A disturbed young woman shows up at the police to report a murder she claims to have seen in a vision. Oberländer believes it to be a hoax, but Zeiler is not letting go of the matter. Few hours later, the man described is found dead.
A wolf roaming the woods causes unrest among the population and attracts dubious characters to Lake Constance. When one of them, a trophy hunter, is found dead in his self-made wolf trap, detectives Zeiler and Oberländer are called upon.
While Zeiler has still not returned from her vacation, Oberländer has problems getting used to her replacement, the resolute Detective Hoffmann from Vienna. But soon a complicated murder case forces them to cooperate.
Just as the freediver Victor is about to start a new record attempt, the body of his wife is found in the depths of Lake Constance. Detectives Oberländer and Hoffmann suspect that Victor himself may have been responsible for the drowning of his wife.
When Hoffmann’s past catches up with her, not only is the relationship with Oberländer put to a test, but also the safety of her family is severely threatened.
After a book reading, a successful author of crime novels is found dead in his secluded mansion in the mountains. Detectives Oberländer and Hoffmann suspect that the perpetrator was one of the guests at the event.
A decaying ship emerges from the depths of Lake Constance, dredging up a tragic, unsolved mystery from fifteen years ago. The eerie discovery compels Detective Oberländer to confront the past and reopen the case.
A woman's body is found near the mysterious Wishing Tree. Initially, it seems like a crime of jealousy, but as the detectives dig deeper, they question the obvious, unraveling a web of secrets that changes the investigation's direction.
When a young woman's body is discovered at the annual fairground in Bregenz, detectives Oberländer and Eisler unravel a web of secrets within the insular world of travelling carnival workers.
