The Door into Summer
Robert A. Heinlein
 The novel opens in 1970 with Daniel Boone Davis, an engineer and inventor, well into a long drinking binge. He has lost his company, Hired Girl, Inc., to his partner Miles Gentry and the company bookkeeper, Belle Darkin. She had been Dan's fiancée, deceiving him into giving her enough voting stock to allow her and Miles to seize control. Dan's only friend in the world is his cat, "Petronius the Arbiter", or "Pete", whom he carries around in a bag, allowing him out from time to time for a sip of ginger ale. Hired Girl, Inc. 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 Frank) to a large corporation in which Miles would become a vice-president. Wishing to stay independent, Dan opposes the takeover, but is outvoted and then fired as Chief Engineer. Left with a large financial settlement, and his remaining Hired Girl stock, he elects to take "cold sleep" (suspended animation) with his beloved pet cat "Pete", hoping to wake up thirty years later to a brighter future. The examining doctor at the cold sleep facility immediately sees that Dan has been drinking. He gives Dan an injection to start the process of sobering him up, and warns him to show up sober or not at all 24 hours later for the actual procedure. After becoming sober, Dan decides instead to mount a counter-attack. First he mails his Hired Girl stock certificate to the one person he trusts, Miles' stepdaughter Frederica "Ricky" Gentry. Dan confronts Miles and finds Belle in Miles' home. Belle injects him with an illegal "zombie" drug, reducing him to somnolent compliance. Belle and Miles discover Dan's plans to go into cold sleep. Belle alters Dan's commitment documents to have him placed in a repository run by her cronies—a subsidiary of Mannix, the company that was trying to buy Hired Girl, Inc. Dan wakes up in the year 2000, with no money to his name, and no idea how to find the people he once knew. What little money Belle let him keep went with the collapse of Mannix in 1987. He has lost Pete the cat, who fled Miles' house after Dan was drugged, and has no idea how to find a now middle-aged Ricky. Dan begins rebuilding his life. He persuades Geary Manufacturing, which now owns Hired Girl, to take him on as a figurehead. He discovers that Miles died in 1972, while Belle is a shrill and gin-sodden wreck. All she recalls is that Ricky went to live with her grandmother about the time Dan went into cold sleep. Her scheme with Miles collapsed, as Flexible Frank disappeared the same night she shanghaied Dan. Flexible Frank is everywhere in the future, acting as hospital orderly, bellhop, and a thousand other menial jobs once filled by people. It is called Eager Beaver, made by a company called "Aladdin Auto-engineering," but Dan knows someone has taken his prototype and developed it. He is even more baffled to find that the patent is credited to a "D. B. Davis." His buddy Chuck at Geary lets slip that he once saw time travel working, in a lab in Colorado. At that point Dan finds that Ricky has been awakened from cold sleep and left Los Angeles for Brawley, California. Dan tracks her to Yuma, Arizona, where she was apparently married. When Dan looks at the marriage register, he finds that she married "Daniel Boone Davis". He immediately empties his bank account and heads for Colorado. In Boulder, he befriends Dr. Twitchell, a once-brilliant scientist reduced to drinking away his frustrations. Eventually, just as Chuck had told him, Twitchell admits to having created a time machine of sorts. With the machine powered up, Dan goads Twitchell into throwing the switch and finds himself falling. Dan has gone back to 1970, some months before his confrontation with Miles and Belle. Dan is befriended by John and Jenny Sutton and persuades them to help him in his mission. Working rapidly, Dan creates Drafting Dan, which he then uses to design Protean Pete, the first version of Eager Beaver. Leaving John and Jenny to set up a new corporation to be called "Aladdin Auto-engineering," he returns to Los Angeles, and stakes out Miles' house on the fateful night. Watching himself arrive, he lets events unfold until Pete the cat emerges, then takes his own car and uses it to remove Flexible Frank and all his engineering drawings from Miles's garage. Destroying the drawings and scattering machine parts across the landscape, he heads out to meet Ricky at her Girl Scout summer camp. Ricky is remarkably mature for her age, and asks Dan if he is doing this so they can get married. Dan tells her she is correct. He sells his car for quick cash, enough to get him to his cold sleep appointment. With Pete in his arms, he sleeps for the second time. In 2001, he awakes to a note from a much older John Sutton, along with a substantial amount of money. He greets Ricky, now a twenty-something beauty, when she awakes. They leave for Brawley to retrieve her possessions from storage, and then are married in Yuma. Setting himself up as an independent inventor, he uses Ricky's Hired Girl stock to make changes at Geary, settling back to watch the healthy competition with Aladdin.