Basic Trope: A detective turns out to be a bad guy.
- Straight: Jason, a police detective investigating a murder, was working with the criminals the whole time.
- Exaggerated: Jason was the mastermind.
- Jason is the district chief of police.
- Downplayed:
- Jason was an accomplice, being blackmailed into helping the murderers.
- Jason turns out to be investigating the crime on the behalf of another criminal.
- Justified: Jason hoped that by pretending to help, that no one would suspect him.
- Inverted: One of the criminals' supposed accomplice turns out to be an undercover police.
- Subverted: Jason pretends to be a detective to get information on the police, but he undergoes Becoming the Mask.
- Double Subverted: But in the final moments, chooses to stay faithful to the crooks.
- Parodied: Jason is obviously the bad guy, always giving obviously incorrect clues and leads, and intentionally distracting the investigators from any legitimate leads, but no one seems to notice.
- Zig Zagged: ???
- Averted: There are no bad guys investigating the crime.
- Enforced: ???
- Lampshaded: Da Chief has a Heroic BSoD upon realizing who the killer is.Da Chief: "Why, Jason? Why did you do this? You were one of my best men — why?"
- Invoked: Jason worked hard to earn a badge and a good reputation as a cop just for this moment that he can commit a crime and lead the other detectives astray.
- Exploited: Because he is in a position of authority, nobody even bothers to think that Jason could have done it. Just like he planned.
- Jason kills anyone who even comes close to figuring out the mystery, using his position of authority to deflect suspicion for the murders and making everyone who is still alive think that they're dealing with a serial killer.
- Defied: ???
- Discussed: ???
- Conversed: ???
- Implied: Jason is seen walking into Da Chief's office. He is next seen walking out in handcuffs.
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