Rubbish. The ending is truly awful and leaves you with the feeling of 'what a complete waste of my time'. The idea is good and it could have been done over 7 episode with so much more detail and story telling but it wasn't, it was crammed into 4 poor episodes that did not make sense and I'm fairly intelligent!
SPOILERS
1) Car crash scene. What is all that about? Deary me.
2) At one point we saw the astronauts come back to earth, she goes to a holding hotel and then is on her way home on a plane. Something happens to the plane, her husband and daughter look for answers over days/weeks which ultimately leads them to an army base where they bomb an alien. However, we then see the astronauts coming back to earth and they then talk to someone about the army bombing the visitors. No sense at all.
3) Why would the army bomb a small area when they did not even see any alien craft or even hear it or see any signs of it on any radar, they simply bomb nothing.
4) How can someone get shot in the leg and walk home from a desert that takes a helicopter to get to?
5) how would the space agency allow someone onto their ship that has episodes of paranoid schizophrenia??
Don't bother.