Iris can't wait for her baby sister to be born and is disappointed when she turns out to be very fussy, but a day with Grandpa, and a little time for the baby to grow up, help Iris discover she enjoys being a big sister after all.
Iris is excited about her first sleepover at her friend Walter's house, and plans a lot of activities, but when night finally arrives, her feelings change.
Bella knows the family rules but lives by her own, as well, causing her behavior to be "too wild, too rude, and too risky" until Granny brings her a puppy with similar problems.
When Iris moves to the country, she misses the city where she formerly lived; but with the help of a new friend named Walter, she learns to adjust to her new home.