Eunice is walking along the highways of northern England from one filling station to another. She is searching for Judith, the woman, she says to be in love with. It's bad luck for the women at the cash desk not to be Judith, because Eunice is eccentric, angry and extreme dangerous. One day she meets Miriam, hard of hearing and a little ingenuous, who feels sympathy for Eunice and takes her home. Miriam is very impressed by Eunice's fierceness and willfulness and follows her on the search for Judith. Shocked by Eunice's cruelty she tries to make her a better person, but she looses ground herself.

Robert and Katherine Thorn seem to have it all. They are happily married and he is the US Ambassador to Great Britain, but they want more than to have children. When Katharine has a stillborn child, Robert is approached by a priest at the hospital who suggests that they take a healthy newborn whose mother has just died in childbirth. Without telling his wife he agrees. After relocating to London, strange events - and the ominous warnings of a priest - lead him to believe that the child he took from that Italian hospital is evil incarnate.