Keneally was interested, and Pfefferberg became an advisor for the book, accompanying Keneally to Poland where they visited Kraków and the sites associated with the Schindler story.
Kaneally ishte i interesuar, dhe Pfefferberg u bë një këshilltar për librin, duke shoqëruar Keneally në Poloni, ku ata vizituan Krakovin dhe faqet që lidhen me historinë Schindler.