Zach Wells is a perpetually dissatisfied geologist-slash-paleobiologist. Expert in a very narrow area--the geological history of a cave forty-four meters above the Colorado River in the Grand Canyon--he is a laconic man who plays chess with his daughter, trades puns with his wife while she does yoga, and dodges committee work at the college where he teaches. After a field trip to the desert yields nothing more than a colleague with a tenure problem and a student with an unwelcome crush on him, Wells returns home to find his world crumbling.