This is by far, the best Stephen King book I have read in a long time and I love all of his books! The basic premise: if you could, would you go back in time to prevent the assassination of JFK? This is surely something in different forms, we have all considered.(mine would be Hitler) Who wouldn't time travel given the opportunity? However, this thought provoking and frankly beautifully written book skilfully explore the pitfalls and complications of time travel. The main character, Jake, is likeable and keen to do the right thing. Does he succeed in his mission? I'm not telling you, but you will laugh and cry as you travel back to 1958 with Jake.
Just a little sideline- I loved the reference to another of King's masterpieces, "It" and fans of King will easily spot this.
Overall, simply wonderful, I am so miserable now I have finished this book as nothing else I have subsequently picked up is as good!