NoGodsNoMasters wrote:I also have a peeve for when mysteries seems really interesting and involved and it turns out it was completely left-field all along.
I agree. It was also ruined by the fact that she threw the clothes out of the window, despite it being played up as a locked room mystery.
The best mysteries are those where the answer is staring you in the face, but is hidden by a false preconception.
EDITED TO ADD:
The Christmas Special "The Grinning Man" was ruined by the same kind of thing. The completely sealed attic wasn't completely sealed after all.