I once had an interesting conversation with an editor at a writer's conference regarding the reluctance of some publishers to purchase manuscripts that don't tie up all the loose ends by the last page--books whose theology perhaps isn't explicit enough or that leave the final interpretation to the reader. Their mission statements charged the publishers to clearly communicate the gospel, and they rightly measured each submission against this criteria.
I polled the web sites of the major publishing houses and found a wide spectrum of mission statements. Some were very general and focused on well written books that incorporate Christian values and others specifically mentioned pointing the reader to Christ. All of the mission statements communicated a desire to responsibly uphold the high calling entrusted to them.
So, what is the author's responsibility to communicate the message of the gospel? Does the author lead the reader to a carefully crafted conclusion with no loose ends, or enter into a trust agreement that the Spirit will work through the art?
I tend to lean toward trust, I think. All of our loose ends in life are not tied up--sometimes, not even in our lifetimes. To say to the reader that they could be seems incredibly patronizing, and we do not want to appear false. But life is a journey, and we can impress on the reader that there is hope in the One who travels with us in spite of our loose ends.