I just finished reading Snow Treasure by Marie McSwigan. It was published in 1942 by Dutton. The book is still in print! It's a World War II thriller where the children outwit the Germans.
What a legacy to write something that children have enjoyed for almost 70 years.
Sometimes I imagine being in that magical space of a child's imagination, engaging a child in a story he can't put down. If I could do that even once or twice, I would feel well paid for my writing.