There should be a sixth star option just for Sir Terry Pratchett's books. If you have never read any of his books before then I can recommend this as a good starting point. It is a great story set within the Discworld but it doesn't involve any of the main characters found in the other stories. This will give you great introduction to Sir Terry's wit, humor and incredible ability to link fantasy into everyday life.
Already a big fan of the books...have read all disc world novels many moons ago....Nigel planer fantastic range of voices...and had a ring of the great sir Terry himself...thoroughly enjoyed the whole experience