I have a thing about reading up on a place before I go. As we all do. Otherwise we wouldn't use VT.
Anyway... some really good Morocco based books I've read are:
By Bus to the Sahara by Gordon West.
In Morocco by Edith Wharton
The Voices of Marrakech by Elais Canetti
A Year in Marrakesh by Peter Mayne, also resleased os 'The Alleys of Marrakesh'. Ergo I have two copies of the same text :(
All of these books have a great sense of place which, whilst these aren't new books, is still recognisable.