She is a bright and determined fourteen-year-old with a love for science, a sharp sense of humor, and a habit of questioning everything. After discovering that her mother has secretly built a time machine, Millie finds herself caught in a dangerous journey across timelines where every choice has consequences. Though often stubborn and fiercely independent, she is guided by a strong sense of right and wrong—even when doing the right thing comes at a personal cost.

She is Millie's cousin, best friend, and often the emotional heart of the group. Loyal, compassionate, and endlessly persistent, she has a talent for getting herself into trouble almost as often as she gets herself out of it. While she may not always think things through, her courage and devotion to the people she loves make her an invaluable companion. No matter how impossible the situation, Melanie refuses to leave anyone behind.