After nosy neighbor Mrs. Wilgus (the inimitable Kathleen Freeman) alerts Donna and Alex about Mary having a noisy party while they were out, the kids get lectured about being the children of a doctor, and that they should behave accordingly.

Not too long after this, Jeff takes a ride from Mary's troublemaker friend Tommy Hendricks, who doesn't have a license and has taken his father's car out for a joyride, and they get into a minor accident while fleeing a cop.

Donna and Alex help celebrate the 20th anniversary of Wilbur & Celia Wilgus, only for Donna to get caught up in a misunderstanding later.

Alex takes advantage of a tip on the market, and Donna and the kids start making plans for the expected profit.