Time once again for "Name that book!"

[hedgehog]

It's fairly recent, and I'm trying to recall the name because it was the first of a trilogy ( I think). I only saw it in paperback

The plot was based on time travel paradoxes and also involved an alien machine/worm hole that transferred objects to a specific site every 30 days or so. A secret government agency secures each object as it appears and tries to figure out what the hell it does. There is also a mysterious plane crash involving the First Lady, a possible end to civilization as we know it, people running back and forth sending warnings across time to each other.


I've got to start writing these things down!