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Kevin is going to attempt to go back to the "afterlife" - This is fairly obvious from the promos. He does this because his father and the ladies are convinced he's the "Messiah".
While there Kevin sees David Burton(who just died) again, DB will ambiguously tell Kevin he met his friend Matt, somewhat proving this is real. Kevin believes DB will tell him how to prevent the apocalypse, but as usual DB is very shady.
Kevin, frustrated pushes DB down a well.
Nora, believing Kevin to be dead, will, out of anger, sadness etc convince the LADR people she's good to go, she uses the device, doing so sends her to "the Hotel".
She sees, her family, makes peace.
She sees Kevin, they talk, about DB about Matt, etc, they profess their love for each other, Kevin tells Nora a secret that were not yet privvy to.
Like Kevin in season 2, Nora manages to escape the hotel.
Kevin however doesnt, he drinks the water, Kevin dies, for good.
Nora awakes and escapes the machine before it can kill/incinerate her.
She tells the others what just happened and that Kevin wasnt the Messiah, but she knows who is.
After just seeing Kevin die they sadly agree, distraught that they basically just killed their friend.
The end of the world doesnt occur.
Months later people seem to be getting "better", the insanity that has insued over the last 7 years seems to be calming.
We see older Nora, on the bike, asked if she knows a "Kevin", she says no.
She rides home, there is a young man, Kevin and Nora's CHILD.
And Nora is writing a book about him, a book about their son, who she believes to be the true Messiah.
THE END