marks. Most of Anne's time was spent reading and studying, and she regularly wrote and edited (after March 1944) her diary entries. In addition to providing a narrative of events as they occurred, she wrote about her feelings, beliefs, dreams and ambitions, subjects she felt she could not discuss with anyone. As her confidence in her writing grew, and as she began to mature, she wrote of more abstract subjects such as her belief in God, and how she defined human nature. Frank aspired to become a journalist, writing in her diary on Wednesday, 5 April 1944: She continued writing regularly until her last entry of 1 August 1944. Arrest On the morning of 4 August 1944, the Achterhuis was stormed by a group of German uniformed police (Grüne Polizei) led by SS-Oberscharführer Karl Silberbauer of the Sicherheitsdienst. The Franks, van Pelses, and Pfeffer were taken to RSHA headquarters, where they were interrogated and held overnight. On 5 August, they were transferred to the Huis van Bewaring (House of Detention), an overcrowded prison on the . Two days later they were transported to the Westerbork transit camp, through which more than 100,000 Jews, mostly Dutch and German, had passed. Having been arrested in hiding, they were considered criminals and sent to the Punishment Barracks for hard labour. Victor Kugler and Johannes Kleiman were arrested and jailed at the penal camp for enemies of the regime at Amersfoort, in the province of Utrecht. Kleiman was released after seven weeks, but Kugler was held in various Dutch concentration and prison camps until the war's end. Miep Gies was questioned and threatened by the Security Police but not detained. Bep Voskuijl managed to escape with a few documents that would have incriminated their black market contacts. During the following days, the two female secretaries returned to the Achterhuis and found Anne's papers strewn on the floor. They collected them, as well as several family photograph albums, and Gies resolved to return them to Anne after the war. On 7 August 1944, Gies attempted to facilitate the release of the prisoners by confronting Silberbauer and offering him money to intervene, but he refused. Source of discovery In 2015, Flemish journalist Jeroen De Bruyn and Joop van Wijk, Bep Voskuijl's youngest son, wrote a biography in which they alleged that Bep's younger sister Nelly (1923–2001) could have betrayed the Franks. Nelly was a Nazi collaborator