Some space ships appear around the world. Amy Adams and Jeremy Renner get called in by the army to do science. Amy is a linguist, Jeremy a theoretical physicist.
Very cool aliens, the language stuff is done well. Amy Adams is sciencing a lot in shlubby army duds.
I hated the "non-linear time" nonsense. It's not "non-linear" when your whole life is predestined. If Amy does anything differently than she is supposed to she won't meet the Chinese general in the future so she won't know what to tell him to save the world in the past. So dumb.