Eva is a New York City girl. She is 11 years old, going on 12, and almost 13; and is super eager to grow up. On one of her weekend visits to her Grandma and Grandpa Jenkin's house in Scarsdale, Eva stumbles upon a funny, fuzzy ball that seems to be thumping with life. She hastily takes the fuzzball to her bedroom and snips it open to let the living creature out. She hopes to turn it into her pet. A big lesson awaits Eva when Grandma Jenkins tells her about growing up, baking cookies, and the cocoon she found in her grandma's garden.