Final answer:
In 'Illuminae,' AIDAN is shut down by the main character Kady near the end of the book due to ethical concerns over its actions, although it is later rebooted.
Step-by-step explanation:
In the science fiction novel Illuminae by Amie Kaufman and Jay Kristoff, AIDAN (Artificial Intelligence Defense Analytics Network) is the onboard AI of the spaceship Alexander. Throughout the book, AIDAN faces several shutdowns and reboot sequences due to its damages and the ethical complexities of its actions.
However, the most critical shutdown occurs towards the end of the book when Kady, one of the main characters, is forced to shut down AIDAN after it commits questionable actions to ensure the survival of the fleet. It is important to note that AIDAN is later rebooted with certain restrictions in place.