In the sequel to Marsbound, Carmen and Paul, along with a few other human and Martian crew members, are tasked with an interstellar exploratory mission to the presumed home planet of the Others. Despite the “free energy” discovered in the previous book, the trip will take years, skimming the speed of light. But do the Others appreciate the intrusion? And what do they really want?
Most of the book is about the trip itself, and the psychological challenges of living for years in a confined space while hurtling towards what the crew thinks is probably doom. The last part sees humanity confronted once again with the judgment of the mysterious Others. These aliens seem to see humanity as somewhere between clumsy child and dangerous but manageable pest. The fact that humanity is hopelessly outclassed, and can only use its action to prove intent, gives an interesting perspective, as does the fact that the human emissaries feel that those who sent them out really don’t understand the problem. The ending is a massive cliffhanger, leading directly to the third and final book.
Haldeman does not disappoint, with his trademark unexpected but internally consistent logical plot twists. His characters, this time described from three different first person viewpoints, are flawed and realistic, down to little marital niggles that most would rather keep hidden even from themselves.