- A crime is commited.
- A detective (or some other appropriate character) starts investigating the crime.
- She comes across a very obvious suspect: someone who seems to have had the motive and means to commit the crime.
- But she then discovers the obvious suspect couldn't have done it. Maybe the suspect has an alibi, or he can otherwise be ruled out. For example, someone has been murdered, and the forensic evidence reveals the killer was right-handed. The obvious suspect, however, turns out to be left-handed.
- The detective then finds out the real culprit was someone unexpected. For example, it can be someone who seemingly didn't have any reason to commit the crime, until the detective uncovers said reason.
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- Played for Laughs in A Shot in the Dark. Clueless Detective Clouseau ignores blatant evidence that the woman he's infatuated with is the killer, even though she keeps being found standing over a victim, holding the murder weapon, with no idea of what happened. Of course everyone except her turns out to be a murderer.
- Subverted in the Agatha Christie novel The Mysterious Affair at Styles. The murderer deliberately makes himself the very obvious first suspect, then prepares provably fake evidence, so the case against him will be overturned and he won't be suspected again (in English law at the time, one couldn't be tried twice for the same crime).
- Harry Potter:
- Severus Snape is a sly, abusive teacher who has a clear affinity for the Dark Arts throughout Harry Potter and the Philosopher's Stone. It turns out that Snape is not only not the antagonist, he is actively protecting Harry from the antagonist.
- Draco Malfoy is a schoolyard bully who vocally supports the actions of the mysterious Heir of Slytherin in Harry Potter and the Chamber of Secrets. Harry and co. spend months investigating the connection between the two, but it becomes obvious Draco has nothing to do with the Heir.
- Harry Potter and the Half-Blood Prince sees Harry suspect Snape and Malfoy yet again, this time of hatching several failed assassination plots from within Hogwarts. By this point, Harry's friends and allies are Genre Savvy enough to attribute his suspicion to his dislike for both people. As it turns out, Harry is completely right about both, even if their situations are much more complex than Harry assumed.
- Angels & Demons sees a plot to exterminate the Vatican with an antimatter bomb. The brains behind the attack remain hidden until the novel's end, but that doesn't stop Professor Langdon of suspecting Maximilian Kohler, a vocally anti-religious scientist who helped fund the antimatter bomb to begin with.
- Parodied in The Macbeth Murder Mystery by James Thurber, in which a detective novel fan reads Macbeth and decides that Macbeth, being the obvious suspect, must be a Red Herring and thus that King Duncan was killed by someone else.
- Lord Peter Wimsey:
- Played straight in Strong Poison, where Harriet is the obvious suspect in the poisoning of Philip Boyes - so much so that the story starts with a judge summing up the evidence for the jury at Harriet's trial. After the jury returns a hung verdict, Lord Peter has thirty days to prove that Harriet didn't do it.
- Discussed in Busman's Honeymoon, just before interviewing the last person to see the victim alive:
Lord Peter: Enter the obvious suspect.
Harriet: The obvious suspect is always innocent.
Superintendent Kirk: In books, my lady.
- In The Rithmatist, there's Professor Nalizar, who is much like Snape- a nasty, arrogant teacher who the protagonist Joel immediately suspects of being involved in the evil doings aroud the school. Eventually, Joel discovers that Nalizar was not the one who caused the disappearances and admits that Nalizar was a hero who saved his life- but in a subversion and something of an invocation of the trope, Joel then finds out that Nalizar was behind it all, and he gloats that, since Joel had already recanted his suspicions, he can't credibly accuse him again.
- Most episodes of iZombie follow this formula, though it gets occasionally subverted when the obvious suspect is revealed to be the killer after all (such as in the episode "Brother, Can You Spare a Brain?").
- Elementary often uses this trope, unlike the Sherlock Holmes stories the series is loosely based on.
- Gotham deals with the origins of various Batman villains and as such it is only a matter of time before The Joker is introduced. Enter Jerome, a Laughing Mad circus freak who murdered his own mother, who imitates the mannerisms of Heath Ledger and Mark Hamill. As "The Last Laugh" shows, the Joker is someone else entirely.
- Shawn from Psych has had a few of these. One example is Emily Bloom from "Black and Tan: A Crime of Fashion". After her bosses (husband and wife fashion moguls) are murdered, she gets fingered as the prime suspect. She had motive (the wife was verbally abusive to her, the husband stole her designs, and she was next in line for company president), means (she made the wife's protein shake which contained the poison that killed her), and gives O'Hara a makeover when she comes to interrogate her (read: bribe). Not only is Bloom not the killer (the couple actually killed each other), she's almost the next victim when she accidentally drinks a poisoned shake.
- Star Trek: The Original Series. In "Wolf in the Fold", Scotty is found on three separate occasions standing over the corpse of an attractive woman with blood on his hands and no idea of what happened. Captain Kirk uses Insane Troll Logic to argue that the ghost of Jack the Ripper is responsible. He's right, of course.
- In the Star Trek: Deep Space Nine episode "The Passenger", a bad guy named Vantika escapes the death of his body by transplanting his mind to another person. The most obvious target for this mind transfer is Kajada, who becomes the main suspect because of this. But then it turns out Vantika actually resides in the brain of Bashir, whom none of the protagonists suspected, even though most viewers had probably guessed it long ago due to a very obvious hint dropped in the first act.
- Hunter would always play this straight, except one episode that did the Bait and Switch. A woman dies during a gang rape, with the culprits let off on a technicality. When they are shot one by one, the victim's sister is the obvious suspect. Then it looks like a Corrupt Corporate Executive has a motive, and she's being framed as a patsy. Nope, it was the sister all along.
- Played straight in 32 out of 34 trial cases in the Ace Attorney games (including the crossover with Professor Layton), where the culprit is not the defendant. That's over 90 percent. Of course, given that the entire premise of the series is of a defense attorney trying to clear his clients of murder charges, the real application of this trope should be when Phoenix's first suspect isn't the guilty one, which happens a couple times as well (most notably with Adrian Andrews in the second game's last case- which happens to be one of the ones where the defendant is guilty!.)
- Parodied in Bob's Burgers: When Linda performs a stage play in the restaurant, Louise plays a butler who reacts dismissive to the murders and loudly remarks that the murder weapon is hers. This is intended as a (lazy) Red Herring, with Linda actually being the killer. When the true killer is revealed, the audience becomes angry since clearly The Butler Did It and there were no clues pointing to Linda.
- Archer: In "Skytanic", when investigating a bomb threat on a zeppelin, Archer at first suggests the German second mate, Kraus, who has a sinister-looking scar emanating from under an eyepatch, but then immediately dismisses him as "too obvious" and moves on to a man in a (Sikh) turban. Turns out Mallory faked the bomb threat to get free tickets, but Captain Lammers coincidentally planted a real bomb (whether he did this independently or because of the bomb threat is unknown) with the intention of shorting the stock and recouping his retirement fund. Kraus knows how to disarm the bomb and also received the scar while saving a Jewish girl from a gang of skinheads who threw him a "curb party" for his efforts. He is unceremoniously shot by Lammers before he can disable the bomb.