A small town gradually becomes aware of a strange creature which picks off people one by one. But what is this creature, and where is it? At the same time, a seismologist is working in the area, she detects _tremors_. The creature lives underground, and can 'pop up' without warning. Trapped in their town, the town-folk have no escape.

A soldier from Earth crash-lands on an alien world after sustaining battle damage. Eventually he encounters another survivor, but from the enemy species he was fighting; they band together to survive on this hostile world. In the end the human finds himself caring for his enemy in a completely unexpected way.