Los Angeles, 1928. When single mother Christine Collins leaves for work, her son vanishes without a trace. Five months later, the police reunite mother and son. But when Christine suspects that the boy returned to her isn’t her child, her quest for truth exposes a world of corruption.
In an attempt to avenge her daughter’s death, Irene Kelly travels across parallel universes, killing her daughter’s murderer again and again. As she becomes consumed by her quest for revenge, her humanity begins to slip away—until the cycle is disrupted when she rescues Mia, a sharp-witted teenager already marked by the killer.