When Bree gets sick and can't join her class on a trip to see a bubble show, Nancy and her classmates decide to put on a bubble show of their own for Bree.
Nancy writes a report for school about her great-grandfather, making things up so he seems less ordinary, but when she learns that Grandpa will be there to hear her read the report aloud she realizes she was dishonest.
When a rainstorm prevents Nancy and her best friend, Robert, from getting to the planetarium the night of a class field trip, she has a brilliant idea for making things better.
Seeing a four-leaf clover at a show-and-share, Fancy Nancy becomes superstitious and goes overboard trying to keep track of everything that is lucky and unlucky before deciding to settle on what she truly believes.