I've been reading a lot on my kindle lately.  I type in free christian and that way I usually don't get books that are explicit.  I found this one book that I really enjoyed called "The Witness"  by Grace Livingston Hill.  It was written in the early 1900's.  It was very "preachy"  some might say, but a really enjoyed her unabashed testimonies of Christ in a work of fiction.  She got me really thinking about how I live my life as a Christian.