she is also, of course, a successful author, collaborating with her daughter emma walton hamilton onyou. >> nice to see you, too. >> you two are prolific. this is the eighth book in in particular series. >> that's right. and our 28th together, if you can believe it. >> i'm always amazed by this, because this is a mother-daughter collaboration that really works. why do you think it works, julie? >> because i think we -- i have to say this. we have a huge respect for each other. and the best idea wins. and it's such a pleasure. it's like playing in a wonderful sand box. there's a lot of work and research from other projects. but it's just fun, isn't it? >> it is. and it's such a pleasure to write for kids. it's such a wonderfully inspiring sort of mission-driven thing to do together. >> now this book has to do with graduation day. >> moving on. >> the larger theme is change, something that everybody can understand. >> yes. and how little girls have to embrace that, too. you know, when they graduate. >> the main character is loosely based on your daughter emma. >> she is inspired by my