This hardcover book, titled "The Door into Summer" by Robert A. Heinlein, is a must-have for any science fiction enthusiast. Published in 1957 by Doubleday / Foundation in New York, this original edition is a rare find. The dust jacket is designed with beautiful artwork by Mel Hunter. The author, Robert A. Heinlein, is a legendary figure in the world of science fiction and this book is a great addition to any collection. The subject matter of the book is classified under the categories of Antiquarian & Collectible and Books & Magazines. This book is a great conversation starter and a valuable addition to any bookshelf.