Anne Frank is perhaps one of the most famous victims of the Holocaust. At the age of 13, while imprisoned in the Auschwitz camp, she began to keep a diary. This diary was subsequently translated into more than 70 languages and became a worldwide bestseller. With her story, Anne managed to convey the full tragedy of the millions of victims of Nazism. 75 years after the death of Anne Frank, Gerard Kremer - the son of a member of the Resistance during the Second World War - investigates the case of betrayal of the Frank family, based on the memories of his father and other witnesses. According to testimony Kremer, the Frank family was betrayed by Anse Van Dyck, a Jew who betrayed other Jews to the Nazis. She became the only woman in the Netherlands to receive a death sentence for collaborating with the Nazis. Although her guilt in the Frank family betrayal case was never conclusively proven at the time, this book reveals many previously unknown facts that may be the key to solving this complicated and terrible story.