Romo's World — Paul J. Joseph

The colonists get a cold welcome upon arrival in Mariner Valley, and soon discover that the many organizations that planned their mission hadn't communicated well on specifics. Worse, the ground crew waiting for them are a collection of angry, tired survivors of ill planning and their new home is a dirty cave. Romo, while eager to get on with his own mission, sees fit to try to make Mars more livable for his friends first. But their enemies are still in the skies above, and there are many things Romo doesn't know about human nature.