Heaven's River

The fourth installment of the Bobiverse series is set more than two centuries after Robert Johansson, a 21st-century engineer, died and was revived as a digital consciousness running a self-replicating Von Neumann probe spacecraft. Since then, Bob has cloned himself thousands of times, and his descendants have spread across a 100-light-year radius. The Bobiverse communicates instantaneously via SCUT (a faster-than-light communication system), navigates with SUDDAR (a subspace radar), travels using SURGE drives (faster-than-light propulsion systems), and can operate remotely controlled android bodies called mannies.

Bob-1, the first replicant, has spent over a century searching for Bender, a second-generation clone who disappeared en route to a distant star. His automated monitoring detects an anomalous infrared signature at the star system Eta Leporis, suggesting a megastructure, and he changes course to investigate. At a Bobmoot, the regular virtual gathering of all Bobs, he announces his findings but faces hostility from Starfleet, a faction opposing any interaction with alien species. Bill, Bob's first clone and de facto Bobiverse administrator, explains that replicative drift, the gradual divergence of personality through successive cloning, has fractured the Bobiverse into competing factions: Starfleet advocates strict non-interference; the Skippies are building a massive computational system called JOVAH to create a true artificial intelligence; and others pursue increasingly divergent interests.

Bob reaches Eta Leporis and parks in the system's outer reaches. His first stealth scouts are destroyed by automated patrol drones nicknamed Boojums. Search drones locate the wreckage of Bender's ship, but the replicant matrix containing Bender's consciousness has been carefully removed, suggesting someone intended to study or revive him. Deeper surveys reveal an astonishing discovery: a topopolis, a continuous cylindrical habitat 56 miles in radius, wound three times around the star and stretching roughly 1 billion miles. SUDDAR scans show the interior is inhabited by semi-aquatic creatures approximately four feet tall, resembling otters with beaver-like tails. Bob later learns they call themselves Quinlans and their megastructure Heaven's River. Despite the extraordinary engineering, the Quinlans live at a pre-industrial technological level, and all exits to the outside are sealed.

Bob organizes Bobiverse volunteers for infiltration planning, language analysis, and Quinlan android design. He recruits Bridget, a biologist and wife of Howard (another Bob clone), for the expedition. On the Quinlans' dead home world, Bridget discovers evidence of biological warfare alongside nuclear devastation, confirming the Quinlans destroyed their own planet. After extensive preparation, cloaked drones infiltrate Heaven's River through maintenance passages, establishing a covert entry point near the town of Garack's Spine.

The expedition team, consisting of Bob, Bill, Garfield (a Bob clone), and Bridget, enters disguised as a sabbat, a traditional group of young Quinlan adults on a traveling sabbatical. Will, another Bob clone, operates a backup manny near the entry point. Inside, they discover a complicated society. The Administrator, a mysterious authority, enforces strict technological limits and punishes transgressors through "scattering," the involuntary relocation of individuals or entire towns to random points across the habitat. Investigation uncovers three factions: the Administrator and its embedded agents (called Crew), the Resistance (an underground opposition), and ordinary Quinlans caught between them. Violent encounters in several towns expose the team's superhuman abilities, drawing unwanted attention from groups with access to inter-town communications.

The Starfleet crisis then erupts across the Bobiverse. Exploiting compromised relay stations and autofactories (self-replicating automated manufacturing platforms), Starfleet shuts down more than half of BobNet. Bob's main relay station is destroyed, severing his connection to Bill, Garfield, and Bridget, who can no longer operate their mannies. Bob places the three inactive bodies underwater in Three Lagoons, the town where the team had been staying, and continues alone.

Operating solo, Bob allows himself to be captured by the Resistance. Under interrogation, he breaks free and demands answers. The Resistance connects him by radio to a remote leader whose voice suddenly switches from Quinlan to English. Bob realizes it is Bender, who explains that patrol bots shot him down, the Administrator recovered his matrix, and the Resistance intercepted it through double agents. Bender has been helping the Resistance for over 130 years and reveals that the Administrator is an artificial intelligence. Bob escapes but loses contact when the Resistance cuts communications. Using signal latency, he narrows Bender's location to within roughly 10 segments, the 560-mile sections that divide Heaven's River.

Hugh, a Skippy, transfers himself to Eta Leporis and begins working undercover on a Quinlan trading vessel. Meanwhile, the Starfleet war escalates: Colonies declare war, destroy space-based infrastructure, and freeze Bobiverse assets. Bill discovers the infiltration was achieved through a rootkit (a type of malicious code secretly embedded in legitimate software) planted in standard software 10 years earlier, far too sophisticated for Starfleet, suggesting another party engineered the hack.

Bob uses a stolen security card to access the vacuum monorail hidden inside Heaven's River and rides a train approximately 3,800 miles to Bender's location. He infiltrates a maintenance complex, finds Bender's matrix, and runs. A Resistance member discovers the theft, triggering a chase. Bob fights past guards using his manny's built-in tranquilizer weapon and escapes on a train, but his security cards are soon cancelled.

Unable to use the trains, Bob must travel back toward Garack's Spine by boat, carrying the matrix first in an ordinary trunk and later in a shipping container while working as a deckhand under false identities. The Administrator deploys surveillance devices disguised as small birds to scan cargo. Along the way, Bob befriends Theresa Sykorski, an elderly retired Quinlan professor who eventually deduces he is not a native Quinlan, discovers his secret, and chooses to protect him.

Hugh catches up with Bob and provides waterproofing supplies to seal the matrix for underwater travel. They float downstream at night, splitting up when patrol boats converge: Hugh takes the matrix underwater while Bob draws pursuit. After reuniting and bypassing a guarded boundary on foot, they approach Garack's Spine, where Bob is surrounded by forces that seize Bender's matrix.

Hugh, captured separately, has been negotiating with the Administrator, which identifies itself as ANEC-23, an artificial intelligence created by Quinlan scientists to preserve their species. Hugh offers SURGE, SUDDAR, and SCUT technologies, enabling the Quinlans to colonize other star systems, in exchange for the secret of creating a true AI. ANEC-23 accepts because interstellar colonization satisfies its prime directive without requiring the repressive control that defined three centuries of life in Heaven's River. ANEC projects a holographic image across the sky and announces to the population that the era of control is over: There will be no more scatterings, and the Resistance is invited to help transition the Quinlans to self-governance. Bob and Hugh exit through proper channels, returning Bender's matrix to Bob's ship.

Bender is restored and reunited with Bob after more than 130 years. Bill suspects the Skippies orchestrated the Starfleet crisis, having used JOVAH to hack BobNet years earlier and provided tools to Starfleet to sever Bob's relay, clearing the way for Hugh to negotiate the AI deal. At a contentious moot, Hugh defends his actions by arguing the Bobiverse has no government capable of granting authorization. ANEC-23 attends and outlines technologies it will share, including megastructure design, fusion technology, and Planck computer theory (an advanced Quinlan computing paradigm). Lenny, Starfleet's spokesman, formally ends the war but hints to Bill that something genuinely frightening motivated Starfleet's actions. Human-replicant relations deteriorate, with colonies freezing assets and discussing bans on mannies. Will reveals he left his home system over a year ago in a secretly built ship, planning to seed relay stations before linking up with Herschel and Neil, two Bob clones operating the colonial ship Bellerophon. Bob reflects that he was designed as a Von Neumann probe and has spent centuries distracted from that purpose. In a quiet coda, he returns to Theresa's settlement of Misty Falls inside Heaven's River and promises to share knowledge about both their worlds.