Jera Buchanan is in a desperate search for Jack Sanderson, her most trusted friend, after he fails to meet her at an appointed place and time. The trail leads her into a deceptive world of shadowy figures where nothing and no one is as they appear to be. She uncovers secret tunnels beneath the city of San Francisco, where knife-edged passageways take her into a depraved world where death seems to reside at every turn. As she uncovers an unsavory side of Jack, she begins to wonder if she ever really knew him.