The crucial factor is that the reader has all the clues to be able to work out whodunnit, even though they may not put them together to work this out.
Clues presented when the detective has gathered all the suspects and pronouncing who did it and how, should have been available to the reader at some point in the book.
For example, it was possible to work out that in one particular Agatha Christie book, they ALL did it!
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