All Systems Red is the tense first science fiction adventure novella in Martha Wells' series The Murderbot Diaries. For fans of Westworld, Ex Machina, Ann Leckie's Imperial Raadch series, or Iain M. Banks' Culture novels. The main character is a deadly security droid that has bucked its restrictive programming and is balanced between contemplative self-discovery and an idle instinct to kill all humans.

On his way to his betrothal, young Lord Penric comes upon a riding accident with an elderly lady on the ground, her maidservant and guardsmen distraught. As he approaches to help, he discovers that the lady is a Temple divine, servant to the five gods of this world. Her avowed god is the Bastard, "master of all disasters out of season", and with her dying breath she bequeaths her mysterious powers to Penric.

The city of Bulikov once wielded the powers of the gods to conquer the world, enslaving and brutalizing millions - until its divine protectors were killed. Now Bulikov has become just another colonial outpost of the world's new geopolitical power, but the surreal landscape of the city itself - first shaped, now shattered, by the thousands of miracles its guardians once worked upon it - stands as a constant, haunting reminder of its former supremacy. Into this broken city steps Shara Thivani.

The Carryx—part empire, part hive—has waged wars of conquest for centuries, destroying or enslaving species across the galaxy in its conflict with an ancient and deathless enemy. When they descend on the isolated world of Anjiin, the human population is abased, slaughtered, and put in chains. The best and brightest are abducted, taken to the Carryx world-palace to join prisoners from a thousand other species. Dafyd Alkhor, assistant to a prestigious scientist, is captured along with his team.

When an experiment to study quantum uncertainty goes spectacularly wrong, physics student Bill Rustad and his friends find that they have accidentally created an inter-dimensional portal. They connect to Outland - an alternate Earth with identical geology, but where humans never evolved. The group races to establish control of the portal before the government, the military, or evildoers can take it away. Then everything changes when the Yellowstone supervolcano erupts in an explosion large enough to destroy civilization and kill half the planet.