It’s a time travel story, and a great one at that.

I don’t know how I missed reading this book during my heyday of reading Heinlein in the 1980-ies, but I did. What he does not realize soon enough is that his fiancée Belle and his buddy Miles are screwing him out of his company. But before he does, he sets his affairs in order. Then he decides to take the Cold Sleep, which is a cryogenic sleep, allowing the person to arrest all body functions and wake up at some time in the future. The company specializes in household robots. He is vastly successful. Dan starts a successful and revolutionary robotics company named Hired Girl. Dan Davis is a genius engineer involved in robotics. There seem to be nudists in many of his plots, and there are some key nudist characters in The Door into Summer. His characters kiss, get naked and have sex. His science fiction always focused on character development, and he is one of the few authors who, besides creating engaging and intriguing science fiction plots, also got into the human side of life. His classic Stranger in a Strange Land is probably his most famous work, but there are many others, and I have read most of them. Heinlein lived from 1907 to 1988 and is widely recognized as the most influential science fiction writer of the 20th century. I don’t know who the woman on the cover art is supposed to be. There are also several women, one villain, Belle, and one heroine, Ricky. Yes, there is a cat central to the plot in this book.

The door into summer book