The Penderwick sisters are home on Gardam Street and ready for an adventure! But the adventure they get isn't quite what they had in mind. Mr. Penderwick's sister has decided it's time for him to start dating--and the girls know that can only mean one thing: disaster. Enter the Save-Daddy Plan--a plot so brilliant, so bold, so funny, that only the Penderwick girls could have come up with it!

As spring arrives on Gardam Street, there are surprises in store for each Penderwick, from neighbor Nick Geiger's expected return from the war to Batty's new dog-walking business, but her plans to use her profits to surprise her family on her eleventh birthday go astray.