Although neutral, Germany invaded the Netherlands (Holland) in May 1940. Although resistance was very strong, the bombing of Rotterdam by the German Luftwaffe had left its city center in ashes. Although the army wanted to resist, without enough artillery and air support to stop the bombers, the Netherlands surrendered on 14 May 1940. It would remain occupied until 1945.
As would become the norm in countries where Germany invaded, strict rules about Jews were immediately imposed. Jews were dismissed from government held jobs, forbidden from visiting public places, and other restrictions were imposed as well. Deportation of Jews began in 1941 sending many to the Mauthausen-Gusen concentration camp. Dutch people opposed the action and organized a two-day strike in February 1941. It did nothing to stop the deportations and by this time every Jew had to wear the Star of David badges on their clothing. There were many atrocities committed against the Jews but one of the worst was the forced eviction of Jews from the Jewish psychiatric institution Het Apeldoornse Bosch. Disabled and mentally ill jews were sent to Auschwitz to be killed.
On 6 July 1942, fearing deportation to a Nazi concentration camp, Otto Frank decided to take his family into hiding along with the Van Pels family. They would later be joined by Fritz Pfeffer. Otto Frank had left Germany when Hitler came into power and settled in the Netherlands selling first pectin and later spices. He had hoped to set up a business in Great Britain, but the plans never came to be. When the Germans invaded and new rules forbade Jewish ownership of companies, he was helped by his employees to keep his business out of German control. Now faced with likely deportation, they decided to go into hiding.
The place that was chose was a Secret Annex above the warehouse of the company he owned. Access was through a bookcase that covered the door. They had to be very quiet in the early morning when workers arrived so as to not attract attention. Usually, some helpers who assisted them came up to join them for lunch (the workers left at this time for their lunches). Johannes Kleiman, Victor Kugler and Bep Voskuijl came up frequently as did Jan Gies. Miep Gies stayed below to keep an eye on things. They were able to learn what was going on through them and listening to a radio. During this time, Anne Frank began writing her diary recording her life and her thoughts about having to hide during this time.
They were able to hide out successfully for two years but on 4 August 1944, the Gestapo discovered the Secret Annex and arrested them along with two Christian helpers. All who hid in the Secret Annex were deported. Only Otto Frank would survive and return home. He would discover the diary written by his daughter, which was published and shared with the world. It would be made into several movies and documentaries.
Lingering questions remain as to whether or not they were betrayed or whether the Gestapo got lucky that day. It is likely that someone, perhaps a known Dutch collaborator, passed on information that Jews were hiding out in the warehouse. It is also possible the raid that occurred had nothing to do with Jews but looking for other things but unfortunately resulted in the discovery of the Secret Annex.