All of the following are characteristics of psychological suspense except

a) development of plot through mental activity
b) research-like writing style
c) emphasis on madness, overt or covert
d) ambiguous protagonists

A psychological suspense is a type of story or movie that involves horror and suspense. The following are the characteristics of a psychological suspense: emphasis on madness, overt or covert, ambiguous or unclear protagonists, and development of plot through mental activity. Therefore, the characteristic that does not belong to a psychological suspense is option B. Research-like writing style.

The knocking on the door stops suddenly.