Julia Jarmond is a fictional character from the novel "Sarah's Key" by Tatiana de Rosnay. She is an American journalist living in Paris who investigates the events surrounding the Vel' d'Hiv Roundup during World War II. Julia's journey reveals the impact of historical events on personal lives and the importance of uncovering hidden truths. Throughout the story, Julia becomes deeply connected to the past, particularly to a young Jewish girl named Sarah Starzynski. As she uncovers Sarah's story, Julia grapples with themes of memory, loss, and the responsibility of remembering history. Her character serves as a bridge between the past and present, highlighting the significance of storytelling.