Suppose the book has $ p $ pages. It follows that $ p \equiv 11 \pmod{12} $. Also, since the second-to-last page has a trivia fact, then $ p-1 $ is divisible by $ 5 $, so $ p \equiv 1 \pmod{5} $. By the Chinese Remainder Theorem, since $ 11 \equiv 1 \pmod{5} $, then $ p \equiv 11 \pmod{60} $. Now, $ p $ is a double-digit number, so it must be either $ 11 $ or $ 71 $. However, the epilogue itself is already $ 11 $ pages long, so it follows that there must be $ \boxed{71} $ pages in the book.