In Ben Bova's 1992 bestselling book Mars, geologist Jamie Waterman and his crewmates discovered the existence of primitive lichen on the floor of the great Martian canyon known as the Valles Marineris. In Return to Mars, Waterman is headed back to the Red Planet, this time in charge of an expedition that hopes not only to study Martian life but also to prove that exploring Mars can be profitable.
Waterman also wants to revisit a part of the canyon where he thought he spotted a primitive cliff dwelling during the first Martian mission. The second voyage to Mars runs into trouble right away, however, as Waterman clashes with Dex Trumball, the son of a billionaire who's backing the expedition.
