"Do you promise that your detectives shall well and truly detect the crimes presented to them using those wits which it may please you to bestow upon them and not placing reliance on nor making use of Divine Revelation, Feminine Intuition, Mumbo Jumbo, Jiggery-Pokery, Coincidence, or Act of God?"— G. K. Chesterton's oath for membership for the British Detective Club.
The opposite of a Clueless Mystery; the puzzle of the story is entirely solvable before The Reveal or The Summation, if you've spotted the clues, and not just by various methods of being a Genre Savvy reader/viewer. The trick, of course, is having it solvable by the reader/viewer, but still difficult enough that they don't all figure it out long before the actual reveal.
It has once been called the greatest game, I'm tempted to agree
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