The Law Above the Law

John Warwick Montgomery, The Law Above the Law (Christian Legal Society 1975).

From CILTPP, a brief description (scroll down):

Montgomery presents the case that modern people must begin once again to judge their behaviour, their laws and their legal systems on the basis of God's revelation of right and wrong. Included as the appendix is the complete text of The Testimony of the Evangelists by Professor Simon Greenleaf of Harvard Law School, the great 19th century authority on common-law evidence.

For more about this modern polymath, here's John Warwick Montgomery's website.

The 2008 book Tough-Minded Christianity: Honoring the Legacy of John Warwick Montgomery is an excellent read, too (and not just because of what is says about Montgomery). Take a look at GoogleBooks.