Four young children whose mother is dead live with their grandmother while their father works away from home. She delights in telling them traditional Irish tales. Shortly after granny tells them a story about a wicked stepmother, their father writes to say he is remarrying.
Terrified, the children run away to find a favorite aunt. On the way, they meet some exceedingly strange characters. Finally, they are brought safely home, to be reunited with their father and their new and loving stepmother who is not frightening at all.