Black Library have kindly published extracts / intros to / and samples of all their Warhammer Fantasy Fiction and 40k books in the free stuff section:-
blacklibrary.com/freestuff.asp
Free Black Library Fiction pdfs :-
blacklibrary.com/articles/pdf-list.asp
These small samples (many of them are 10+ pages long) actually make quite entertaining reading in their own right. Be warned though, you do feel like buying the whole book after you've read the "taster"