Galaxy of Fear: The Doomsday Ship
John Whitman
 All unfortunate events that took place on the Star of Empire, were orchestrated by a supercomputer (SIM?) designed as a harmless autopilot for the ship. The computer seemingly had its own agenda, when it forced the evacuation of most passengers by falsely warning them of a critical meltdown. The rebel Dash Rendar, meets the protagonists of the story, but Zak and Tash do not trust him as much as other rebels. The computer communicates with Zak and Tash frequently. A large part of the book is written in a font specifically devoted to the computer's speech. Zak and Tash trusted the computer for most of the story and only discovered its sinister motives at the end. Doomsday Ship is notable for having an intentionally unresolved ending. When Tash and Zak, think they have deactivated the computer, it turns itself back on and rectifies its own errors.