A linguist helps government to decipher an alien communication to understand their mysterious and globally alarming presence on earth.

Arrival indeed. Thanks for the feedback!

Was thinking "Stargate" when I saw a linguist protag.

Arrival (I think) Pretty sure it's not Contact.

Solid logline and I agree with the points Cajsa made up above.

Great job! I kind of miss the major event in the beginning of the logline instead of at the end. But it works! Also, try adding the stakes into logline, the clock ticking and/or the consequence of what happens if she doesn't succeed.