Return to Mars (Grand Tour Series #3)

Six years after the first manned Martian expedition, a second has been announced, one motivated purely by its profit potential. Jamie Waterman, half-Navajo, half-Anglo geologist, is commander of the new exploratory team and thus must contend with a bitter rivalry, a disturbing new emotional attraction, and deadly "accidents" that appear to be sabotage, all of which could doom the mission to failure. But there is more at stake than these concerns for there are still great secrets to be uncovered on this cruel and enigmatic world, not the least being something he glimpsed in the far distance during his first Martian excursion: an improbable structure perched high in the planet's carmine cliffs, a dwelling that only an intelligent being could have built.