A wraith is a trace, a wisp, a spirit that appears just after or shortly before its death. After living in an old mansion for almost 10 years the Lukens family experiencing loneliness and anxiety suddenly discovers a ghost-like presence trying to communicate with them. About the same time the mother, Katie discovers she is pregnant, a ghost-like presence tries to communicate with them. The spirit wants to become part of the family. It first contacts Lucy, saying she wants to be her sister. It also seems to protect all the life in the house. In her quest to know who or what the spirit is, Katie is advised to visit a retired priest. Father Ehrlich, blind for unknown reasons, can see a spirit, whether it is human or otherworldly. But then the spirit – the Wraith – warns that a great evil is about to descend upon the house and father Ehrlich must fight off this demon to save them all.