All of the above: good plot, good characters, good writing, etc.
In mysteries (as opposed to "Thrillers," which I'm not especially fond of) I need to find hints to the resolution in the storyline, but if I can figure it out and the protagonist plods along without making progress, I lose interest.
My education and former day job were science related, so if a SF author tries to justify a plot twist or development with meaningless jargon, I'm likely to move on to the next story.
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