In general i´m not a big “fiction-reader”, most of the stuff i´m reading is technical literature on screenwriting, directing or moviemaking in general.
My regular “must-reads” are screenwriting magazines i really enjoy: Script Magazine and Creative Screenwriting. Another magazine i really like is the Austrian film-magazine Ray.
Besides this regular literature i´m currently reading The Film Director’s Intuition: Script Analysis and Rehearsal Techniques from the great author Judith Weston (which by the way also wrote Directing Actors, in my opinion one of the most valuable books on directing).
This book is not a “become a director in 21 days” like reading, it works on a completely different level. Judith Weston provides a great “behind the scenes” view of working as actor as well as director, she sheds light on working below the surface of a script.
In my opinion this book (and Directing Actors as well) is a must-read for directors, actors and screenplay writers, it is crucial to have a clue of the different approaches.