YouTube is a great place to look for book trailers, and with these two trailers, you won't be disappointed!
The 5th Wave, by Rick Yancey, is set in an apocalyptic United States that has been nearly wiped out by the work of aliens. These aren't your ET or Ender's Game aliens, though; these super intelligent aliens launch a massive, silent invasion on a world-wide scale. Cassie, the main character, tells the story, which also alternates among other characters' points of view. Check out the trailer:
The next trailer is for an Iowa Teen Award nominee, Marie Lu's Legend. The second book in the series, Prodigy, is also available. Fans have to wait until November for the third book in the series, Champion. In Legend, the United States is now the Republic, and main character June is being trained to work in the highest military circles. When her brother is presumably killed by the elusive criminal Day, both of their lives take dramatic turns. Here's the trailer for the first two books:
Happy viewing! And feel free to browse YouTube for both student-made and official book trailers--we may have the book you see here in the library for you!