Why are they here?

When mysterious spacecrafts touch down across the globe, an elite team - lead by expert linguist Louise Banks (Amy Adams) - is brought together to investigate. As mankind teeters on the verge of global war, Banks and the team race against time for answers – and to find them, she will take a chance that could threaten her life, and quite possibly humanity.

Special Features
Xenolinguistics: Understanding Arrival
Eternal Recurrence: The Score
Acoustic Signatures: The Sound Design
Nonlinear Thinking: The Editing Process
Principles Of Time, Memory, & Language