Spoilers follow for both murder plans and the solution of Double Alibi.
Double Alibi is an anime-original mystery, international episode 1248 (Japanese episode 1189). Watchmaker Hanno kills his mentor, Kobuchi, in the mountains near Okuho, then lets the body reach a lake by boat. The apparent impossibility depends on treating the place where the body is found as the place where the killing happened.
There are two alibis because Kobuchi also intended to kill Hanno while appearing to be fishing at the lake. The eventual killer uses part of the intended victim’s own preparations, so the death cannot be explained by reconstructing only one person’s plan.
A threatening letter and a body in a boat
Hanno is responsible for a large mechanical clock at a hotel. He asks Kogoro and Conan for help after receiving a threatening message that uses a stopped clock as an image of his death. The request presents him as someone whose life is in danger.
Elsewhere, Professor Agasa and Haibara find Kobuchi’s body in a boat drifting on a lake. He has suffered a fatal blow to the head, and a stun gun is in his pocket. The recent discovery of a fierce argument between master and pupil makes Hanno a natural suspect.
The hotel is about an hour’s drive from the lake. Taken together with the estimated time of death and Hanno’s hotel presence, that distance seems to rule out his traveling there, killing Kobuchi and returning. The journey looks like a firm barrier only while the lake remains the assumed murder site.
Kogoro tests the hotel alibi
Hanno says he was working in his room and received room service before half past seven. Kogoro examines the window, the drainpipe and the timing of a collection vehicle, and concludes that a concealed departure from the hotel is possible.
This solves only one part of the problem. Leaving unnoticed does not automatically give Hanno enough time to make the longer lake journey. The investigation must also test whether its supposed destination is correct.
A young girl, Natsumi Sasagawa, hears Kogoro’s suspicion and attaches the detective and Hanno with toy handcuffs. The comic interruption later has a practical consequence: it limits Hanno’s opportunity to slip away and dispose of evidence.
The fishing story does not fit the location
Conan joins Agasa and Haibara at the lake. Kobuchi had supposedly gone fishing, but a lakeside shop worker says it is not the fishing season. The claim about his activity therefore becomes another detail that needs checking rather than a reliable account of where he spent his time.
Aoi Suzueda, another pupil, describes a mentor who presents his pupils’ work under his own name. Kobuchi had taken credit for a new mechanical-clock design developed by Hanno. The argument has a specific cause: the theft of work and recognition within a damaged teacher-pupil relationship.
Hanno confronted Kobuchi over the appropriation. Kobuchi, in turn, planned to remove him. The murder motive and the intended victim’s own murderous intent grow from the same conflict, which is why the physical preparations overlap.
The two plans meet in the mountains
Hanno had written the threatening letter himself. Presenting it to Kogoro made him appear to be a client whose life was in danger, while giving him a witness to his presence at the hotel. The original request was already part of his alibi preparation.
Through Sleeping Kogoro, Conan explains that the true meeting place was in the mountains near Okuho, about thirty minutes by car from the hotel. Hanno received room service, left covertly using the route Kogoro had considered and drove to the mountain location, where he killed Kobuchi.
Kobuchi had arranged to appear to be fishing while traveling upstream in a motor-equipped boat. He intended to lure Hanno into the mountains, incapacitate him with the stun gun and make the death look accidental. The weapon found in his pocket belongs to that unrealized plan.
After killing Kobuchi, Hanno sends the body back toward the lake in the boat. This transfers the apparent crime scene to a place too far from the hotel for the accepted timetable. He removes the motor, concealing the means by which the boat could have reached the upstream meeting place.
The distinction between travel routes is the key. Hanno does not need to make the supposedly impossible hotel-to-lake round trip. He needs to reach the nearer mountain site, then let the body’s later location suggest that a different journey occurred.
The flowers and the motor undo the substitution
Setsubunso plants found on the boat tie it to the mountain area. Within the local geography established by the case, that plant grows around the Okuho mountain site rather than the lakeside discovery point. Its presence supports the boat’s journey from upstream.
The boat motor is then found concealed in Hanno’s car, by the passenger seat. It connects him to the removed equipment and the relocation of the body. The botanical clue identifies the relevant route; the motor links the suspect to the means of using it.
Once exposed, Hanno attempts to return to his car to dispose of evidence, but Takagi stops him. The toy handcuffs’ earlier interference has made it harder for him to deal with the incriminating object before the deduction reaches it.
Why the title means more than two excuses
The case is satisfying because the alibi does not collapse through an arbitrary adjustment of minutes. It collapses when the investigation asks a more fundamental question about place. The body’s position is evidence of where it arrived, not automatically of where the fatal attack happened.
The out-of-season fishing, mountain plants and detachable motor each contribute to that correction. Kogoro’s practical attention to the hotel escape also remains useful, even though it cannot solve the distance problem by itself.
The bitter element is the symmetry between teacher and pupil. Kobuchi is a murder victim, yet his boat and stun gun show an intention to become a killer himself. Hanno’s crime does not erase that earlier plan, and the earlier plan does not erase Hanno’s responsibility.
A story about clockmakers is an apt setting for a timing puzzle, but the final effect comes from the ruined relationship. The two men build competing protections around the same meeting, and the fragments of those plans become the evidence that explains the death.
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