'... clothed in righteousness divine'
The Cross-Centred Life
C. J. Mahaney
Mahaney shows what happens when you get it.
God's Lavish Grace
Come and warm your cockles.
The Justification Reader
Good all round, but especially for seeing that justification by faith alone is not a Reformation invention.
The Future of Justification
Not for everyone but useful if you've heard about some of the recent debates.
The Doctrine of Justification by Faith
Carl Trueman and John Owen
This is pretty exhaustive, but a doctrine worth taking your time over.
The Doctrine of Justification
A treat to set you up for life!