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.
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 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.