Laconic / A Riddle Wrapped in a Mystery Inside an Enigma

Stock Phrase to emphasize mysteriousness.
Visit the unabridged version in a mystery wrapped in a enigma surrounded by a conundrum encased in a cryptogram hidden in a Sudoku puzzle.

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/ARiddleWrappedInAMysteryInsideAnEnigma