Chapter 1: Introduction to Annemarie and Ellen - Annemarie and Ellen are best friends who live in Copenhagen, Denmark during World War II. - They enjoy playing together and going to school, but their lives start to change when the Nazis invade Denmark. - Ellen is Jewish, and her family is in danger because the Nazis are targeting Jewish people.

Chapter 2: The Arrival of the Nazis - The Nazis start to take control of Denmark, and soldiers are seen everywhere. - Annemarie’s older sister, Lise, died in a car accident a few years ago, and her parents are still grieving. - Annemarie’s parents are worried about Ellen’s safety and decide to help her by pretending she is part of their family.

Chapter 3: The Importance of the Necklace - Annemarie’s mother gives her a necklace with a Star of David pendant, which is a symbol of Jewish identity. - Annemarie’s family wants her to wear the necklace to school every day to make it seem like she is also Jewish. - The necklace becomes a symbol of bravery and resistance against the Nazis, as Annemarie wears it to protect Ellen and other Jewish people.

Overall, these chapters introduce the main characters, Annemarie and Ellen, and set the stage for the challenges they will face during the war. It highlights the friendship between the girls and the risks Annemarie’s family is willing to take to protect Ellen. The necklace becomes a powerful symbol of resistance and solidarity against the Nazis.