Go to either sparknotes.com or pinkmonkey.com. I suggest sparknotes. Naturally, I think the overall meaning of the book is to tell us about the evil within our hearts.
" The beast" You know, where evil resides in the heart.
Simon in Lord of the Flies said that "the beast may just be us."
in ch.7, it says: it is important to note that when the boys pass through the burned out forest, the ashes blind them. This temporary blindness is symbolic of the boy's real blindness, their inability to s� the real beast-- the evil within their hearts.