The examining doctor at the cold sleep facility immediately sees that Dan has been drinking. Left with a large financial settlement, and his remaining Hired Girl stock, he elects to take 'cold sleep' ( suspended animation), hoping to wake up thirty years later to a brighter future. Wishing to stay independent, Dan opposes the takeover, but is outvoted and then fired as Chief Engineer. manufactures robot vacuum cleaners, but Dan had been developing a new line of all-purpose household robots, Flexible Frank, when Miles announces his intention to sell the company (and Flexible Frank) to Mannix Enterprises in which Miles would become a vice president. Dan's only friend in the world is his cat, 'Pete' (short for Petronius the Arbiter), a feisty tomcat who hates going outdoors in the snow. She had been Dan's fiancée, deceiving him into giving her enough voting stock to allow her and Miles to seize control.

He has lost his company, Hired Girl, Inc., to his partner Miles Gentry and the company bookkeeper, Belle Darkin. The novel opens in 1970 with Daniel Boone Davis, an engineer and inventor, well into a long drinking binge. Then Ginny said, 'Oh, he's looking for a door into summer.' I threw up my hands, told her not to say another word, and wrote the novel The Door into Summer in 13 days. I kept opening other doors for him and he still wouldn't leave. He'd seen snow before and I couldn't understand it. Our cat-I'm a cat man-wanted to get out of the house so I opened a door for him but he wouldn't leave. When we were living in Colorado there was snowfall. The idea for the novel came from an incident outlined by Heinlein later: The novel was made into a film by Takahiro Miki in 2020.

Heinlein, originally serialized in The Magazine of Fantasy & Science Fiction (October, November, December 1956, with covers and interior illustrations by Kelly Freas). The Door into Summer is a science fiction novel by American science fiction writer Robert A.

怒月 by Robert A. Heinlein