This short story is approximately 4,000 words.
An overwhelming alien invasion has broken Earth's last human encampment. The few ragged survivors flee into the mountains. But the strange aliens have a horrible secret: they can see the thought-trails the humans leave behind. And now the aliens follow these same trails into the mountainside forest to hunt - and feed - on their human prey.
This story is about one alien tracker, thirsty for human thoughts, chasing one man.