On a snowy winter night in 1964, Dr. David Henry rushes his pregnant wife Norah to the hospital, where, with help from her husband and nurse Caroline Gill, she delivers their son Paul. However, Dr. Henry discovers that his wife was carrying twins, and helps her deliver the second child, a baby girl named Phoebe. Shortly after Phoebe's birth, he finds that she has Down Syndrome, and hands her over to Nurse Caroline, explaining that the death of his ill sister nearly destroyed their mother and he doesn't want Norah to go through that. Instead, he instructs Caroline to take Phoebe to a nearby institution for the mentally ill, figuring the child won't live much longer, and tells Norah that Phoebe was a stillborn. However, after visiting the institution and seeing the state of the other patients, Caroline takes the baby home with her, stopping along the way to buy formula and diapers...

In 709 AD, in the Iron Age, a spacecraft crashes in the Viking kingdom of Herot, Norway, and the pilot Kainan survives. He turns the beacon on; learns the language and culture of the planet using a machine; and finds that the predator, Moorwen, that he was transporting, had escaped. While chasing the alien monster, he finds a village completely destroyed and is arrested by the warrior Wulfric, believing that he killed the locals - Kainan is brought to Herot as a prisoner.