System Collapse (2023) is the seventh installment in Martha Wells’s The Murderbot Diaries series and the second full-length novel, following five novellas and one novel that trace the evolution of a self-aware Security Unit (SecUnit) navigating freedom, trauma, and reluctant attachment in a corporatized future. The series begins with All Systems Red (2017), which introduces the self-named Murderbot, a part-organic, part-machine construct that has secretly disabled its governor module, the software that compels SecUnits to obey human commands. Murderbot uses its autonomy to watch thousands of hours of television, including a soap opera called The Rise and Fall of Sanctuary Moon, and avoids social interaction. In this first book, while providing security for a planetary survey team led by Dr. Ayda Mensah, Murderbot uncovers a corporate conspiracy that endangers the crew. The mission forces Murderbot into close contact with humans who, for the first time, treat it not as equipment but as a person. Mensah ultimately purchases Murderbot’s contract, offering it a path to legal freedom on Preservation, an independent system outside corporate control.

The next three novellas follow Murderbot as it struggles with the question of what to do with freedom it never asked for. In Artificial Condition (2018), Murderbot investigates an incident in its past in which it apparently killed 57 miners, discovering along the way that the massacre was caused by a corporate client who deliberately hacked its systems. During this journey, Murderbot meets ART (Asshole Research Transport), a powerful sentient research vessel from the University of Mihira and New Tideland, whose forceful personality and intellectual curiosity make it both an irritant and a genuine companion. In Rogue Protocol (2018), Murderbot continues gathering evidence against the corporation GrayCris and encounters Miki, a bot that openly considers its human companions friends, a dynamic that unsettles Murderbot but quietly challenges its insistence on emotional detachment. Miki’s death protecting its humans lingers as a painful illustration of the costs of care. Exit Strategy (2018), the fourth novella, brings Murderbot back into Mensah’s orbit when GrayCris kidnaps Mensah in retaliation for her legal actions against the corporation. With help from ART, Murderbot rescues Mensah and dismantles GrayCris’s conspiracy. At the novella’s end, Murderbot tentatively accepts a place among Mensah’s people, though its comfort with that sense of belonging remains deeply uncertain.

The scope of the series expands in Network Effect (2020), the first full-length novel, which reunites Murderbot with ART when ART kidnaps Murderbot and Mensah’s daughter Amena, desperate for help in rescuing its own crew from hostile colonists on a remote planet. These colonists, called Targets, have been driven to violence by alien contamination, a biological hazard left behind by a long-vanished Pre-Corporation Rim civilization that insidiously rewrites both organic and machine neural processes, blurring the line between self and contagion. During the rescue, Murderbot creates a copy of itself, designated 2.0, which successfully persuades a corporate SecUnit, later named Three, to disable its governor module and assist in freeing ART’s captured crew. The novel deepens Murderbot’s bond with ART, whose traumatic experience of being invaded and controlled mirrors Murderbot’s own history of forced compliance.

The sixth entry in the series, Fugitive Telemetry (2021), is a novella that takes place between Exit Strategy and Network Effect. In it, Murderbot investigates a murder on Preservation Station, and the narrative takes the shape of a classic murder mystery. As Murderbot searches for a killer, it continues to navigate its status as a free SecUnit, learning to collaborate with mistrustful humans and police authority.

When System Collapse begins, Murderbot is still on the alien-contaminated planet featured in Network Effect, working alongside both ART’s crew and the Preservation team to prevent the corporation Barish-Estranza from claiming the colonists as indentured labor. However, Murderbot is grappling with a new and destabilizing crisis: It has begun experiencing involuntary shutdowns triggered by fabricated trauma memories, the construct equivalent of flashbacks, rooted in its organic neural tissue. The loss of 2.0, who sacrificed itself to stop the contamination in Network Effect, compounds Murderbot’s distress. Having spent the entire series building the capacity for connection while resisting the vulnerability that connection demands, Murderbot now confronts the possibility that its trauma fundamentally compromises its ability to protect its people. In this seventh novel, Murderbot looks for new ways to fight for them when brute force and tactical superiority are no longer enough, proving its ever-increasing bond to the humans, despite its best efforts.