The Door Into Summer by Robert A The provided text, excerpts from the novel "The Door Into Summer" by Robert A. Heinlein, details the protagonist Daniel Boone Davis’s turbulent journey through betrayal and time. Davis, an inventor who co-founded a robotics company, is swindled by his business partner Miles and fiancée Belle and subsequently opts for the "Long Sleep," a form of suspended animation, to seek revenge by waking up in a future where they are old. He wakes up in the year 2000/2001 and must adjust to the advanced society while searching for his beloved cat, Pete, and his young friend, Ricky, all while trying to reestablish his engineering career and uncovering the existence of imperfect time travel, which he uses to return to 1970 to right the wrongs against him and those he cares for.

Heinlein