10year old with sleeping problems

we have just read "10 year with sleeping problem" not being able to sleep by themselves.  Our 10 year old daughter will go to bed fine (at approx 8.00pm) just recently she has began coming out to us crying saying "i'm frighten/scared",  the problem intensifies when we go to bed (leaving her night light on), she will come up to us crying (in a state) and will not return to bed without someone with her, once taken back to bed she will return shortly after in the same state.  Making her return to bed herself only makes matter worse.  She is an avid reader and has recently read a book that she is now saying has scared her and she is frighten in her bedroom.  She will not discuss the book or her fears, but will play quite happily in her bedroom during the day.  She has always been frighten of the dark.  could you please offer some suggestions or advise, we have tried speaking with her about this problem but no luck so far.