On a distant Earth colony， an orphaned survivor of an alien invasion discovers that the greatest world-ending dangers aren’t behind her。 It’s been eight years since an alien invasion drove a small surviving group of settlers to seek refuge in an underground shelter。 Cut off from the rest of humanity， the ragtag band has maintained a narrowly functioning colony due to communal effort and salvage runs。 Alex Archer has her own duties as a dog handler。 While this off-world colony may be harsh， Ash， Alex’s black shepherd raised to sense threats， makes living in it a little nicer。 But the tenuous hide-and-seek with the monstrous species known as the Lankies is about to come to an end for Alex and her close-knit crew of soldiers， techs， and friends。 When a salvage operation goes catastrophically wrong， the Lankies home in on the humans。 With hopes of a rescue long faded， all Alex has left is will―and the fear that there’s so much more to lose。