One of the most quoted non-Mormons by LDS General Authorities is C.S. Lewis, the famous Christian apologist. Considering how much he is quoted by them, it seemed a good idea to compare his ideas to Mormon thought and beliefs. Reading his introduction to Christian faith "Mere Christianity" was frustrating. His theology was at best problematic and the arguments sometimes contradictory. Probably his strongest writing is when discussing morality. Much of what he says on that topic could be acceptable regardless of religious affiliation.
Book I: Right and Wrong as a Clue to the Meaning of the Universe
Book II: What Christians Believe
Book III: Christian Behaviour
Book IV: Beyond Personality: Or First Steps in the Doctrine of the Trinity