This is a children's book written by Sinikka Nopola and Tiina Nopola titled "Nu gäller det, Risto Rappare." The book is illustrated by Sami Toivonen and Aino Havukainen. It is published by Bonnier Carlsen, a well-known Swedish publisher specializing in children's literature. This book is likely to be a charming and entertaining read for children with engaging illustrations and a captivating storyline. Enjoy this beautifully crafted book and encourage your little one's love for reading.