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(published in some regions as 22/11/63 ) is a 2011 science fiction alternate history novel by Stephen King . It is widely considered one of his most ambitious and emotionally resonant works, moving away from his traditional horror roots into deep historical research and romance. Book Overview

The "obdurate" nature of the past (it resists change with literal obstacles), the "butterfly effect," and the moral cost of playing God. Key Plot Points

Jake's friend Al, owner of a local diner, discovers a time portal in his pantry that leads consistently to September 9, 1958 . Al, dying of cancer, enlists Jake to stay in the past until 1963 to prevent the assassination of John F. Kennedy .

Jake (under the alias George Amberson ) lives in the late 50s and early 60s, researching Lee Harvey Oswald to confirm if he acted alone before taking a life to save the President.