Mary gets an engagement ring and phone calls from Matt, a freshman at UCLA, but doesn't tell anyone in the family about the ring or why Matt is calling.

So what's going on? As Donna says, ""Alex, our daughter has a secret.""

A lady spots Donna and Mary having lunch in a restaurant, so she stops to say hello. She recognized Donna, even though ""it's been 13 years."" Donna doesn't recognize her but is polite and too embarrassed to ask her name. Later, Donna realizes she must find out who the mystery woman was.

While babysitting for the Damons, Mary meets their older son, Rick, who has dropped out of college because he wasn't accepted by his father's old fraternity. He plans to join the Foreign Legion and wants Mary to help him.

When Herbie suggests his visiting friend Ken goes along with them to the dance, Mary decides not to go to the dance at all. Then she meets Ken, who's in full uniform from the Carter Military Academy. Yeah, she wants to go to the dance now! But where does that leave Herbie? It's another good ""Mary learns a lesson""