Listed is a vintage 1964 science fiction book written for children. What makes this book fun to read is not only being a science fiction book, but the future mentioned in the book is the year 2017 and children were on the Mars colony.This paperback book is in good condition. There is the name of the previous book owner inside the front cover, otherwise, the book is in very good condition having clean, unmarked pages that do not have tears or bent corners.