Pollux is an engineer at the dynamo, the terraforming center of Mars. Completely alone in the mountain engine and stuck well past the standard length of duty of three months, strange visions begin presenting to him.

First they are simply images, but soon they transform into what seem as living apparitions of workers from the past and the future. In a series of letters to his estranged sister, he tries to lay out the case for these visions being part of reality, and not his own manifesting insanity. But could all these visions be sparked from his traumatic experiences fighting in the frontier against a band of raiders?