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The worst happened on a summer day in 1944, when investigators discovered their secret world behind a movable bookcase and rounded them up.
Of the eight Jews hiding, seven died before the Holocaust was over, including Anne, whose diary was a testament to the horrors of the Nazi regime. She died of typhus at age 15 at Bergen-Belsen camp in Germany.
And for decades, her father Otto tried to figure out who tipped off the Nazis - a question historians have debated for 72 years.
Now, the Anne Frank House museum in Amsterdam has put forth a new theory:
Maybe it was all just a coincidence.
For decades, the common theory has been that Anne Frank's family was betrayed, possibly by a new employee at her father's business or a conspirator's wife unsympathetic to the plight of the eight Jews hiding from Nazis in secret rooms.
But, according to a research paper published this month by the Anne Frank House museum in Amsterdam, "this explicit focus on betrayal, however, limits the perspective of the arrest ...other scenarios tend to be overshadowed."
Historians' theories were based on Otto Frank's suspicions, which centered on Willem van Maaren, a new employee who hadn't been let in on the secret about the hiding place.
"We suspected him all along," Frank told a Dutch newspaper in 1963.
On its website, the museum says van Maaren was an inquisitive type who became suspicious and "laid a trap in the warehouse once: on the corners of the tables there are sheets of paper which fall off when you walk past."
Still, no conclusive evidence has ever come to light of van Maaren alerting authorities, the paper says.
Through the decades, others have been identified as potential betrayers, including Dutch National Socialist Tonny Ahlers, as welle as the wife of an employee who helped Anne's family hide.
But no one has cast serious doubts about the betrayal theory --- until now.
In part, that's because historians believed the three investigators who found the Jews hiding in the Opekta building were members of the Sicherheitsdienst, which tracked down potential enemies of Hitler's Nazi regime.
But new information uncovered by researchers showed the three men Otto Frank later identified as the investigators weren't looking for enemies of Nazis, but were likely assigned to track down people committing ration card fraud or dodging service in the military - not hunting down Jews.
Gezinus Gringhuis, for example, had previously been assigned to track down Jews, but had a new assignment - "investigating economic violations," according to the research paper.
In her diary, Anne repeatedly wrote about the arrests of men who had been caught dealing in illegal ration cards "so we have no coupons."
Such arrests were often reported to authorities, who frequently came across hiding Jews as they tried to sniff out people with phony ration cards.
The research paper also highlights other circumstantial evidence that pokes holes in the betrayal theory. Many phone lines were cut off, for example, which would make it hard for civilians to call authorities about Jews in hiding.
"This creates a real possibility that the call, if it actually took place, came from another government agency," the paper says.
The paper stressed that there is no conclusive theory about how Anne's family was discovered --- including the paper's own claims.
"In any case, the Anne Frank House's investigative report indicates that more was going on in the building (than) only people being hidden there," it says. "The possibility of betrayal has of course not been entirely ruled out by this ...Clearly, the last word about that fateful summer day in 1944 has not yet been said."