mention the other books in intro

intro.tex

@@ -5,7 +5,6 @@
 \subsection*{Overview}
 
 \begin{itemize}
-
   \item
   BIND\footnote{`BIND' stands for `BIND is not D\&D'.} was an attempt to fix D\&D which got out of control.
   \item
@@ -21,13 +20,22 @@
   \fi
   \item
   BIND kills all house rules, by allowing people to integrate those rules into the core book and reprinting.
-
 \end{itemize}
 
+\subsection*{Context}
+
+This book won't work alone.
+The most important book to find, is an adventure module.
+Seek out \textit{Escape from the Horde} if you don't have a module in mind.
+
+This book covers the complete rules for action resolution.
+Every other book references the rules here, but nobody needs to read this book from cover-to-cover --- it's only for reference.
 
-\subsection*{Further Reading}
+If you're a player, have a look at the \textit{Book of Stories}.
+It covers character creation, gaining \glsentryshortpl{xp}, and cultural notes on \gls{fenestra}.
 
-If you're looking for a pre made adventure and stories to tell, find yourself a copy of \textit{Escape from the Horde}.
+If you're a GM, check out the \textit{Book of Judgement}.
+It begins with building a map, then describes \gls{fenestra}'s ecology, with details on creatures, and per-season encounter tables.
 
 \subsection*{Special Thanks \ldots}