About the book: 1996 / Frek is a Dutch boy living in Amsterdam. His friend's name is Sally, he is a Jewish boy. The war began, and Sally began to be in great danger. Even before going underground, he wanted to give Frek his whistle, but he refused. Frek and Grandma Klomp became real friends. Grandma Klomp taught him a lot from the Bible. After the war, Freck received a whistle from Sally. And a letter...