Mysteries and thrillers are not the same things, though they are literary siblings. Roughly put, I would say the distinction is that mysteries emphasize motive and psychology whereas thrillers rely more heavily on action and plot.

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“Mysteries and thrillers are not the same things, though they are literary siblings. Roughly put, I would say the distinction is that mysteries emphasize motive and psychology whereas thrillers rely more heavily on action and plot.”