The Bobs have successfully established human colonies on multiple worlds, but the threat to humanity isn't over yet. After the Battle of Delta Pavoris, the Others have finally recognized the Bobs (and by extension, humanity) as a threat and now, Earth is on the top of their To Consume list.
Vastly outnumbered and outgunned, the Bobs must rally to take a last stand at Earth, but the Others aren't their only problem. Political unrest, distrust between the Bobs and the ephemeral humans, and an unknown quantity of Medeiros probes still threaten to destroy fragile peace on humanity's colony worlds.
This book contains examples of:
- Androids Are People, Too: Legal status notwithstanding, the Bobs are treated by their descendants as a valuable part of the family and as minor celebrities or valued co-workers by everyone else.
- Apocalypse How: Class X-2. Bill uses his asteroid movers to fling Epsilon Eridani I and one of Epsilon Eridani III's moons at the GL-877 system. Two new Bob clones, Daedalus and Icarus, guide these planetoids to collide at light speed in the middle of GL-877's star, sparking an accelerated fusion process and causing the star to go nova.
- The Ark: The Bellerophon, a derelict Others cargo vessel with some asteroid mover plates slapped onto it and enough space to hold Earth's remaining 14 million humans and change.
- Homeworld Evacuation: The degradation of Earth's biosphere (and the impending threat of the Others' fleet) makes it necessary to accelerate the rate of migration.
- Cloning Blues: Zig-zagged. The Bobs in general are fine with being clones of the original, but the further removed they are from the original Bob, the more concerned they are about their standing in the Bobiverse hierarchy. Herschel and Neil, who are something like 16th-generation Bobs, constantly refer to themselves as pond scum, usually in the context of lamenting their lot in life.
- La Résistance: Marcus joins a resistance movement against the governing council of Poseidon. His solution? Build the flying cities that the council wouldn't and invite the disgruntled residents of Poseidon to move in.
- Hidden Army Reveal: The Bobs try to invoke this trope with the Joker group during the Battle of Sol. The strategy was to sneak a battle group into the Others' blind spot after they performed their large area scan. The Others manage to follow up their first scan with a second one quickly, blowing the surprise.
- Interstellar Weapon: Bill uses his asteroid movers to chuck a couple of planetoids at GL-877.
- MayflyDecember Romance: The relationship between Howard and Bridget. Gets upgraded to Eternal Love when Bridget accepts Howard's offer to become a replicant like him.
- Metal-Poor Planet: Recolonizing the Pav homeworld after the Others finish strip-mining the Delta Pavoris system is impractical because the Others were so thorough that it would be practically impossible to find enough metal to make a handful of coins, much less restore an industrialized society.
- Mile-Long Ship: The Others' cargo vessels are 10 km long and 1 km in diameter. Their interiors are large enough to house large cities and have room to spare.
- The Monolith: Bob leaves one on one of the moons of Delta Eridani 4 as a landmark for the Deltans to discover once their society advances far enough.
- Poor Communication Kills: Averted; Herschel and Neil try to activate the derelict Others ship before notifying the other Bobs because they want all the credit for the find. Luckily, they don't destroy themselves before passing along their find.
- Resurrected Romance: Once Bridget is replicated, she and Howard continue their relationship as immortal space probes.
- What Measure Is a Non-Human?: Bridget's daughter Rosie makes a strong push against her relationship with Howard because of his replicant nature.