A warning given to Laura Palmer
in Twin Peaks: Fire Walk With Me
by the grandson of Mrs. Tremond, after Mrs. Tremond gives Laura a picture to hang on the wall. The book
with the pages torn out is obviously Laura's secret diary
if you've been watching the movie, but the meaning of "the man behind the mask" is as debatable as most of the Twin Peaks
The Fire Walk With Me FAQ at http://www.users.zetnet.co.uk/agill/tp/fwwmfaq.htm contains such speculation as:
"When Mrs. Tremond's grandson tells Laura: 'The man behind the mask is looking for the book
with the pages torn out. He is approaching the hiding place. He is under the fan now.' he's
obviously talking about BOB."
"I'm still not sure if Mrs. Tremond's grandson was saying that BOB is the man behind the mask,
and Leland is the mask; or that Leland is the man behind the mask, and BOB is the mask."