Consider - Holo Series, Book 1 Author:Kristy Acevedo [Young Adult Fiction (Ages 12-17)] — Mysterious holograms claiming to be humans from the future suddenly appear from the sky, heralding the end of the world. They bring an ultimatum: heed the warning and step through a portal-like vortex to safety, or stay and be destroyed by a comet they say is on a collision course with earth. How's that for se... more »nior-year stress? But without the ability to verify their story, Alex is forced to consider what is best for her friends, her family, and herself. To stay or to go. A decision must be made. With the deadline of the holograms' prophecy fast approaching, Alex feels as though she is living on a ticking time bomb, until she discovers it is much, much worse.« less