Thriller fiction featuring serial killer investigations. The most searched crime thriller subgenre.
The serial killer needs to be compelling as a character — pure monster is less interesting.
The investigator should be flawed and driven by personal stakes.
Profiler protagonist (psychological analysis of the killer) is the dominant commercial approach.
A ticking clock (next victim will die in X hours) is the most effective pacing device.
Use these as variations in your 7 KDP keyword fields to capture a wider range of searches.
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