The Preposterous Puzzle
In text form:
ONGOKEAU TTFDNQAN ITHZTEEC HLTIEZST RUINKTLU EHSLSIEH TUSNOTPO EUIOOSGD
The word preposterous traces to the roots prae (before) and posterous (subsequent).
The modern usage of this word conveys an absurdity, but it was originally meant more precisely to convey something that is out of order... taking something that should be subsequent and putting it before. (Maybe you can suggest a more modern way of conveying this idea, but let's just go with this for now).
It is in this sense that this puzzle is preposterous, because the answer tells you how to find the solution to this puzzle.