Astrid Holleeder is a Dutch lawyer and writer . She is the sister of criminal Willem Holleeder and was, together with her older sister and a former friend of Willem, a witness to his prosecution. Her memoir Judas sold 80,000 copies on the first day of publication. The book became the best-selling book in the Netherlands in 2016. Her second book, Diary of a Witness, also became an instant bestseller.