In 1994, Zahara Douglass watches her twin sister Annica disappear into a stranger's car, only to discover that nobody else remembers Annica ever existing. Five years later, as the world prepares for Y2K, new evidence finally gives Zahara a chance to prove her sister was real. She hires a private investigator and follows a trail into her family's hidden past, where two men who served with her father in Vietnam appear to hold the answers. Their involvement reveals a dangerous struggle for power in which the sisters may be pawns. To reunite with Annica, Zahara must confront the truth about her memories and her own abilities, knowing that bringing her sister home could unravel reality itself.