"Ellery Queen" The Adventure of the Disappearing Dagger (TV Episode 1976) - Plot Summary Poster


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  • An elderly amateur criminologist finally figures out how a five-year-old "locked-room" murder was committed, and is murdered by the killer before he can alert Inspector Queen. Ellery takes up the challenge himself. The criminologist had first implicated an airline pilot, because he was flying the plane where the murder was committed and had the opportunity to toss the murder weapon out the window. Nobody else seems to have been able to get rid of the weapon, but Ellery finds that the murder victim had stolen someone else's invention, and that the murderer may have invented the weapon as well.

  • A retired cop turned private detective who's a mentor and friend to Ellery's father is killed. Richard learns the man wanted him to go see him but he was away at the time. They go to his place and find he was going over one of his old cases, the murder of an arms manufacturer who was killed while in his private plane when it was in flight which took place five years ago. It seems like the man was stabbed and everyone with him was drugged and when the murder weapon was not found, the detective assumed that the killer's the pilot because he was the only one who was not drugged and he could have disposed of the weapon by throwing out of the plane. They learn the detective hired another detective to watch his back but apparently the killer placed him out of action long enough for the killer to get to the detective. Richard finds out that he sent for everyone who was on the plane. So he has them brought in. One of them the stewardess goes to see the inspector and says that the detective sent for them so that he could tell them that he made a mistake five years ago that the pilot is not the killer and he now knows what really happened and who the real killer is. He showed them something. When she describes it, Richard deduces it's a sinker but what significance is it. Ellery sets out to find out.


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