Hannah's teacher plans a party to celebrate the one hundredth day of school. But on the day of the big party, Hannah is too sick to go. She misses out on the fun! But when she returns the next school day, Hanna finds that adding one can make things extra special.

Margaret McNamara is the author of the Robin Hill School series, and she gets many ideas from her daughter’s own school experiences. She lives in New York City.Mike Gordon illustrates the Robin Hill School series and has an extensive and varied background in illustration and design. He lives with his family in Santa Barbara, California.