The Sparkliest Day of the Year is the first book in the series based on the popular children's show DreamWorks Gabby's Dollhouse. The story follows Gabby as she shrinks down to play in her magical dollhouse, where she interacts with her cute cat friends. The narrative revolves around a special celebration—the Sparkliest Day—which involves fun, crafts, and teamwork. The book is highly visual, capturing the show’s positive themes of creativity, friendship, and problem-solving, making it an engaging and comforting read for young fans of the show who love all things sparkly.