"The Light We Lost" is a novel by Jill Santopolo that explores the complexities of love and loss. The story follows Lucy, a young woman who experiences a deep connection with Gabriel, a man she meets on the day of the September 11 attacks. Their relationship evolves over the years, shaped by personal choices and life events. As Lucy navigates her career and relationships, she grapples with the impact of her love for Gabriel. The narrative delves into themes of fate, ambition, and the enduring nature of love, ultimately questioning what it means to truly live and love.