The following books are available for free download – it would be prudent to do so while they are available. My personal recommendations would be The Difficult Doctrine of the Love of God and Love in Hard Places. The Difficult Doctrine…. would have a place on my personal Top Ten list.
Letters Along the Way: A Novel of the Christian Life (Crossway, 1993)
Holy Sonnets of the Twentieth Century (Baker, 1994)
The Difficult Doctrine of the Love of God (Crossway, 2000)
Love in Hard Places (Crossway, 2002)