Holly Sykes is a fictional character from the novel "The Bone Clocks" by David Mitchell. She is introduced as a teenager in the 1980s and serves as the central figure around whom the story revolves. Holly's life is marked by personal struggles, including family issues and relationships, which shape her journey throughout the narrative. As the story progresses, Holly becomes intertwined with supernatural elements and a larger cosmic conflict. Her character represents themes of time, memory, and the interconnectedness of lives across different periods. Holly's experiences reflect the complexities of growing up and the impact of choices on one's destiny.