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.

This book is part of a book series called Robin Hill School .

This book has been graded for interest at 4-6 years.

There are 32 pages in this book. This book was published 2013 by Simon & Schuster Ltd .

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. The artist, Mike Gordon, specialises in humorous illustrations and has won several awards for his work. He is based in Santa Barbara in California.