On a late summers evening at the Benson household, a mysterious visitor at the door (Russ Tamblyn) changes all their lives. In an instant, they find themselves in charge of an abandoned foster child, Deidre (Vanessa Koman). While the new Dad is delighted, his mean-spirited wife (Michelle Bauer) despises Deidre and plots to get rid of her once and for all. What neither of them realizes is that little Deidre is a junior witch in training whose mission is to help the quarreling couple find new happiness in their lives. Through the use of magic and a bit of mischief.