Special Agent Chester Desmond is a character in the Twin Peaks movie Fire Walk With Me, and this is a blanked-out version of the associated poem:
THROUGH THE DARKNESS OF FUTURE PAST
THE MAGICIAN LONGS TO SEE
ONE CHANTS OUT BETWEEN TWO WORLDS
FIRE WALK WITH ME
The blanks provided don't exactly match these words. It turns out there are blank spaces where some of the underscores should be. (Reminds me of what happened to Chester Desmond...) The letters that fill in those "missing pieces" spell the answer, SPADE.