After the devastating alien attack, disparate pockets of survivors emerge into a shattered world. They quickly realise they must put their differences aside if they are to stand any chance of survival. For they are not alone. Something sinister lurks in the shadows and whatever it is, it won't consider its victory complete until it has killed every last human. But who are these attackers and why are they hell-bent on destruction?

As the dust settles on their brave new world, the survivors are forced to face some cold truths. Catherine is stunned to discover the part she played in bringing about the alien attack. Helen becomes fixated on revenge. And Emily momentarily regains her sight. But is the miracle cause for celebration, or concern?

The alien’s connection to certain survivors raises difficult questions. Bill makes a startling discovery. Sacha’s behaviour is increasingly erratic. And Tom’s birthday proves cause for celebration. But at what cost?

Tragedy strikes, altering the course of the future forever. Catherine’s priorities change with the arrival of Sophia. Things come to a head between Jonathan and Sacha. And Emily’s so happy she can see again that she’s stopped asking why, even if others haven’t.

The survivors attempt to turn the tables on their aggressors once and for all. Mokrani and Catherine prepare for the fight of their lives. Emily seeks answers, at any cost. And Sacha’s visions continue, giving a confounding glimpse of the future.