Coursework - Criticisms of my current plot

After doing further research into the genre I found that my current plot was quite ineffective due to:

-Narrative: The time focussing on the detective's family could be lessened to show that they're minor characters as the plot will revolve around the detective himself like other crime thrillers such as: 
This also emphasizes on their status as the crime victims. In the film Zodiac (2007) , the victims who are alive have a very small amount of screen time (prior to being killed.). 
-The lack of tension:
- This could be created by using restrictive narrative ranges where the audience will know more than the main character 
 -Sound can also be used to create this
-Vague and weak backstory with small links : What petty crime did the suspect commit?, why is he desperate?, why is the detective so unsympathetic with him?, 
 -The audience should be informed of this context in some way!!

Character:-If the antagonist has super powers, will that make the film seem too unrealistic and divert the theme away?
                                 

-SCRIPT: -What will the characters say?
                 -Will the dialogue have significant meanings (foreshadowing, giving information etc...)