While Batman escapes from an acidic doom, Catwoman and her gang proceeds to steal some priceless opals.
A reformed Catwoman goes to college while a life sized Batman statue is stolen in the city.
Someone abandons a child at the Stones' place. Attached to the baby is a note, that upsets the entire household, including their Irish maid:
His name is Willie. He's a good boy and hardly ever cries.
When the local police are informed, Donna can't part from the baby. She wants to keep him until his mother is found. Alex caves in to Donna and allows the baby to stay for the time being. Jeff, meanwhile, doesn't like the thought of a person who might become a sibling, but he soon warms up to it.
Meanwhile, Donna does some investigation on her own. She realizes that a baby name Guillermo might be called Willy. And who has a son named Willy? The milkman!
Donna goes to his house to investigate. She finds out that the milkman is upset due to his young wife dying while having little Willy. But why did he choose Donna Stone to look after it? Because he knows Donna has a happy and loving home, and that she'd look after the child.
The milkman says he realizes he did the wrong thing. He gives her a piece of cheese for helping. Donna then hooks the milkman and her maid together and all is well again in Hilldale.