Spoilers follow for the murder, framing scheme and blackmail reveal.
The Mouri Family House Sits is international episode 1199 (Japanese episode 1141), an anime-original case. The literary critic who hires Kogoro Mouri is also the murderer. He turns an unusually generous house-sitting arrangement into a staged investigation intended to make Kogoro accuse someone else.
The final twist makes his calculation even uglier: he murders Fujieda because he believes Fujieda is blackmailing him, but the threats actually come from the victim’s wife, Kumi. The house-sitting trick succeeds in creating confusion; the belief that prompted the killing is wrong from the start.
An easy job with suspiciously generous conditions

The critic approaches the Mouri Detective Agency and asks Kogoro to stay at his mansion for three days while he travels out of town. The main duty is feeding his cat, Tama. The fee is high, the food and alcohol are freely available, and Ran and Conan may come too. Construction work on the second day is presented as little more than a noise inconvenience.
Kogoro initially doubts that this is detective work, but the conditions quickly win him over. Ran reminds him that it is someone else’s house. Their familiar difference in attitude makes the opening comfortably domestic, which sharpens the change when the mansion becomes a crime scene.
Visitors begin arriving on the first day, even though the owner is away. They say he summoned them, and their strained relationships with him become apparent. One visitor arrives angrily; another has come to apologize over a literary review praising Fujieda. Instead of simply keeping an empty house occupied, Kogoro is placed among people with grievances and unfinished business.
The planned construction exposes a body

On the second day, Ran opens the door expecting workers and finds police officers instead. An anonymous report says that the critic was seen burying someone in his garden. Police dig at the site intended for a new library and discover Fujieda’s body with a kitchen knife still in his chest.
The critic becomes an obvious suspect because the body is on his property. He protests that it makes no sense to bury a victim where scheduled construction will uncover the remains. That apparent absurdity is part of the pressure the story places on the investigation: a suspicious situation can also be made to look too suspicious to be genuine.
A bag tag and the strangely timed visits add further misleading details. Kogoro assembles an explanation that points toward Kumi. Conan, however, is not satisfied with a chain of clues that appears designed to lead a detective to a particular accusation.
The house-sitting assignment is the framework of the trick

The critic killed Fujieda and buried him in the garden. His absence, the presence of Kogoro’s family, the visitors and the misleading objects make up a constructed scene. Hiring Kogoro gives the murderer a detective who can discover the arranged evidence and deliver the conclusion he wants.
That is why the generous job matters to the solution. The client is not merely trying to be somewhere else when the body is found. He has organized who will be in the house and which interpersonal tensions they will encounter, making an apparently helpful service part of the misdirection.
The staged clues begin to work against him when they are considered together with his fear of exposure. His actions repeatedly circle back to the same vulnerable point: an embarrassing manuscript he wrote under another name. The attempt to direct suspicion elsewhere serves the person most anxious to keep that past hidden.
The manuscript, the mistaken target and Kumi’s role

The critic has built his position on harsh literary judgments, while an old manuscript of his own threatens that reputation. Someone uses the possibility of making it public to pressure him. Fujieda’s behavior convinces him that Fujieda is responsible, and he decides to silence him.
The blackmailer is actually Kumi. Her attempt to defend her husband through intimidation leads the critic to target the wrong person. Fujieda himself is not involved in the threats. The resolution also explains the critic’s abrupt praise of Fujieda in the literary review, tying that initially odd detail to the pressure he was under.
Kumi’s involvement does not make Kogoro’s accusation correct: blackmailing the critic and murdering Fujieda are different acts committed by different people. Keeping those responsibilities separate is the essential final correction to the performance the critic arranged.
The quiet ending carries the weight of the case

The unsettling contrast is between the precision of the staging and the error behind it. The critic calculates how other people will appear guilty while failing to establish who is actually threatening him. His concern for his reputation becomes a murder built on an assumption.
Tama, sleeping peacefully amid all these human schemes, keeps the original job present in the story. Kogoro’s concern for what will happen to the cat provides a small humane note after the confession. The comfortable three-day stay cannot be recovered, but that ordinary responsibility still matters.

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