From the publisher blurb:
Medusa. A jungle world ripe for exploitation. Its gigantic prism trees have colourful iridescent pigments within the woodgrain. This is a world of loggers, pushed by Tharsis Corporation to move farther out, to bigger and more valuable trees. But the jungle is dangerous, spores are toxic to humans, and the face masks sometimes don't do their job. Everyone knows someone who went crazy in the field, in his truck, on R&R.
Clone workers have been brought in to help keep up production. They are immune to the spores - the local colonists feel their livelihoods are threatened.
And why are the Marines on Medusa? What are they up to in that secretive jungle camp they've established near the south pole?
Medusa is a deadly forest moon, shrouded in secrets and lies.