"It Starts with Us" by Colleen Hoover is a sequel to "It Ends with Us." The novel continues the story of Lily Bloom as she navigates her new life after her tumultuous relationship with Ryle. She reconnects with her first love, Atlas Corrigan, while dealing with the complexities of co-parenting her daughter with Ryle. The book delves into themes of love, forgiveness, and second chances, offering a heartfelt and emotional journey that fans of the first book will appreciate.