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The night watchman found a blood-soaked axe leaning against the kitchen wall. The entire Gruber family, from the elderly patriarch to the youngest child, lay dead in the barn and their beds. Yet, for days after the murders, smoke still curled from the chimney of the Hinterkaifeck farmstead, meals were eaten, and livestock were cared for. Someone was living among the corpses.
Andreas Gruber was a cantankerous farmer in his sixties, known across the rural Bavarian countryside for quarrels with neighbors and a volatile temper. His wife, Cäzilia, sharp-tongued and reserved, managed the household and the farm’s finances. Their daughter, Viktoria Gabriel, had returned to live on the farm with her two young children, seven-year-old Cäzilia and two-year-old Josef, after her husband's death in World War I. Viktor’s death left Viktoria vulnerable to rumors about the paternity of her youngest. The family’s lone servant, Maria Baumgartner, had just arrived on March 31, 1922, seeking refuge and steady work.
Hinterkaifeck was isolated, set at the edge of a wood nearly a kilometer from the next nearest homestead. The path to the farm was rutted and muddy, especially during the cold, wet spring. The Grubers’ isolation was as much social as geographic; neighbors spoke in hushed voices about family secrets, legal disputes, and the persistent rumor of incest between Andreas and Viktoria. The Grubers were both feared and shunned.
In the weeks before the crime, Andreas reported finding strange footprints in the snow, leading from the woods to the farm, with none returning. He claimed he heard footsteps in the attic and found a newspaper on the doorstep addressed to someone else. The family dog barked at night, and a set of house keys went missing. No one in the family left the farm for days at a time, but they did not report these incidents to the police. Andreas brushed it off—perhaps out of pride, perhaps out of disbelief.
On the evening of March 31, 1922, Maria Baumgartner arrived at Hinterkaifeck, carrying her few belongings in a battered suitcase. She barely had time to unpack before the murders began. Sometime after dusk, one by one, Andreas, Cäzilia, Viktoria, and the young Cäzilia were lured into the barn, possibly by noises or the suggestion that an animal had escaped. Each was killed with repeated blows from a mattock, a pickaxe-like tool kept in the barn. The killer used the blunt end with such force that some skulls split open; the older Cäzilia’s face was shredded by repeated strikes. The little girl’s hair was torn out by the roots, suggesting she survived long enough to pull at her scalp in terror.
After the slaughter in the barn, the killer returned to the house. Maria Baumgartner and Josef were murdered in their beds. Maria was killed instantly; Josef’s bassinet was smashed. The method was as brutal as in the barn—multiple blows with the mattock. The killer then covered each victim’s face with hay, cloth, or a sheet, as if to conceal them from view.
For the next four days, Hinterkaifeck appeared to function as usual. Neighbors saw smoke rising from the chimney and heard the livestock being tended. The mailman noticed that old newspapers had been taken in from the porch. The family’s dog was heard barking, then whimpering. Several people came to the farm but left after receiving no answer at the door, assuming the family was simply busy.
On April 4th, Lorenz Schlittenbauer, a neighbor, led a search party to Hinterkaifeck after the Grubers failed to attend church and Viktoria’s daughter missed school. They found the barn doors locked from the outside. Inside, hay covered the bodies of Andreas, Cäzilia, Viktoria, and the little girl. In the house, the searchers found Maria and Josef dead. The farm was in eerie order; animals were fed, the kitchen was tidy, and recently baked bread sat cooling.
The investigation began immediately, led by Inspector Georg Reingruber and officers from Munich’s Kriminalpolizei. They combed the scene for evidence. The murder weapon, a mattock, was found hidden in the attic. Footprints in the yard matched those reported weeks earlier. The doors were locked from the inside, and there was no sign of forced entry. The murders had likely taken place over an hour, perhaps longer, given the methodical nature of the killings and the distance between the barn and the house.
The bodies were autopsied in the barnyard, watched by horrified villagers. The coroner determined that the Grubers and Viktoria’s daughter had been killed first, followed by Maria and Josef in the house. The brutality of the wounds suggested someone with great strength—and great rage. Small traces of blood were found on the walls, on clothing, and on the hay. The killer had tried to clean up, perhaps to mask his presence, or simply to keep the animals calm.
Suspicion immediately fell on Lorenz Schlittenbauer. He had a complicated history with the Grubers. He claimed paternity of Josef in a legal dispute, then retracted it. He was the first to enter the farmhouse, reportedly unlocking the door without a key and disturbing the crime scene. He later contradicted himself during police questioning about how he entered the house and his actions in the barn. Yet, Schlittenbauer’s alibi was accepted by the authorities, partly because so many villagers had grudges against the Grubers, and partly because there was no physical evidence tying him to the crime.
Other suspects emerged. A vagrant was seen in the woods nearby, but he disappeared before police could question him. Rumors flew about soldiers returning from the war, embittered and traumatized, seeking revenge or money. Investigators questioned local men with histories of violence or theft, but no one confessed. The Grubers’ reputation for lawsuits and quarrels meant there were dozens of people with motive—or at least the anger to wish them harm.
The most chilling evidence came from the family’s dog and livestock. The animals had been cared for after the murders, fed and watered, for several days. The dog was found tied up and injured, suggesting it had been beaten or silenced. The presence of fresh food on the kitchen table and the burned-down stove meant the killer, or killers, had stayed in the house after the murders, using the Grubers’ supplies, sleeping in their beds, and eating their meals. Several witnesses reported seeing smoke and hearing normal activity at the farm during those days.
No money or valuables were missing. The motive did not appear to be robbery. The brutality and the killer’s willingness to linger on the scene suggested a deep connection to the victims, or a calculated desire to taunt the community. The careful covering of the faces of the dead and the feeding of the animals hinted at a mix of remorse and control.
Police scoured the area for clues, interviewing more than a hundred people. They took fingerprints from every surface, analyzed footprints, and examined writing found in the house. The technology of the time limited their ability to gather forensic evidence. No fingerprints could be matched to a suspect. No item belonging to the killer was found.
The autopsies revealed further horror. Viktoria’s corpse showed signs of strangulation, in addition to her head wounds. The elder Cäzilia’s face was so disfigured that she was nearly unrecognizable. The little girl’s fingers were broken and blood was found under her nails, suggesting she had tried to defend herself or, perhaps, was alive for hours after the attack, dying slowly in the barn. The killer had struck with such force that the mattock blade was bent.
The press seized on the family’s reputation, repeating rumors about incest and legal disputes. The authorities considered the possibility that the crimes were committed by more than one person, given the sequence and speed of the killings. Yet, no clear evidence of accomplices emerged.
In the days after the murders, hundreds of people visited Hinterkaifeck. Some took souvenirs, disturbing the crime scene. The skulls of the victims were sent to Munich for study, in hopes that psychic mediums could divine the killer’s identity. The skulls were never returned and disappeared during World War II bombings.
Years passed. Each anniversary saw new theories. Some suspected a traveling craftsman who had worked on the Gruber farm. Others pointed to the family’s inheritance disputes. A local man with a history of mental illness confessed in 1927, but his knowledge of the crime was vague and inconsistent.
No one was ever arrested or tried for the Hinterkaifeck murders. The farm was eventually demolished, and a shrine was erected in its place. The case remains officially unsolved.
The case exposed the limitations of early 20th-century forensic science. Investigators lacked the tools to gather and analyze evidence like fingerprints or DNA. They relied on witness testimony, which was often unreliable or colored by village gossip.
The murders revealed the isolation and suspicion at the heart of rural German life in the early 1920s. The Grubers’ social status and contentious relationships made the investigation more difficult, as witnesses feared reprisals or sought to settle old scores.
The killer’s decision to remain at the farm, tending to animals and living among the dead, introduced an element of psychological terror that was unlike any other crime of the era. The fact that the bodies lay undiscovered for days, while life appeared to continue as normal, stunned the community and police alike.
The careful staging of the murder scene—the covering of faces, the cleaning of the kitchen, the care of animals—suggested a killer who was both methodical and unnervingly calm. This level of composure pointed to planning and familiarity with the farm, raising the possibility that the murderer had visited or even lived there before.
The open-endedness of the case continues to draw speculation. The absence of clear motive—no theft, no public confession, no obvious beneficiary—means that every new theory must account for both the brutality and the intimacy of the crime.
The Hinterkaifeck murders remain Germany’s most infamous unsolved crime. The farmstead’s location, now a field and memorial, draws visitors every year who hope to uncover new clues among the ruins.
The disappearance of the victims’ skulls during World War II eliminated the possibility of modern forensic analysis, cutting off the last avenue for a definitive answer.