From Goodreads: Two days before the start of her junior year, seventeen-year-old Janelle Tenner is hit by a pickup truck and killed—as in blinding light, scenes of her life flashing before her, and then nothing. Except the next thing she knows, she’s opening her eyes to find Ben Michaels, a loner from her high school whom Janelle has never talked to, leaning over her. And even though it isn’t possible, Janelle knows—with every fiber of her being—that Ben has somehow brought her back to life.
But her reincarnation, and Ben’s possible role in it, is only the first of the puzzles that Janelle must solve. While snooping in her FBI-agent father’s files for clues about her accident, she uncovers a clock that seems to be counting down to something—but to what? And when someone close to Janelle is killed, she can no longer deny what’s right in front of her: Everything that’s happened—the accident, the murder, the countdown clock, Ben’s sudden appearance in her life—points to the end of life as she knows it. And as the clock ticks down, she realizes that if she wants to put a stop to the end of the world, she’s going to need to uncover Ben’s secrets—and keep from falling in love with him in the process.
From debut author Elizabeth Norris comes this shattering novel of one girl’s fight to save herself, her world, and the one boy she never saw coming.
I've seen this described as a cross between 24 and The X Files so YES PLEASE! It really does sound rather good don't you think?
It's published April (US) and June (UK)