There are two volumes published by William Swan Plumer which examine in great deal the mediatorial offices of Christ as Prophet, Priest and King, both of which merit in-depth study by those who wish to delve into this important aspect of Christology.
The first is an abridgment of an original work by George Stevenson (1771-1841), a Scottish divine who was instrumental in the founding of the Associate Synod of Original Seceders, having written the doctrinal part of its 1827 Testimony (the historical portion of the Testimony was written by Thomas M’Crie the Elder). Stevenson’s original work, The Offices of Christ, was first published in Scotland in 1834, with a second edition following posthumously in 1845, and it has received high acclaim. Plumer published his abridgment with the same title in 1840. The 1845 edition has over 500 pages of material, while Plumer’s abridgment tops out at around 150 pages.
The second is an original work by Plumer titled The Rock of Our Salvation: A Treatise Respecting the Natures, Person, Offices, Work, Sufferings, and Glory of Jesus Christ (1867). It covers many additional aspects of the person and work of Christ beyond his mediatorial offices (see here for our previous notice of this work along with a table of contents), but the portion covering the mediatorial offices constitutes just under 80 pages out of a volume that is over 500 pages in length. His practical lessons for Christians after examining Christ as Priest and King are very devotional and encouraging.
Together these works represent a synthesis of Scottish and Southern Presbyterian (though Plumer was born in Pennsylvania, he ministered and taught a great deal in the South and is considered to be “one of the most renowned men of the old Southern Presbyterian Church”) perspectives on the mediatorial offices of Christ. And though neither Stevenson nor Plumer was a Reformed Presbyterian (or Covenanter), a Reformed Presbyterian in the vein of William Symington (author of the classic work on Christ’s kingship, Messiah the Prince (1840), would find in their works much with which to happily agree on the kingly office of Christ, particularly regarding the universal scope of his dominion and reign. (Another similar Scottish-Southern Presbyterian take on the universal dominion of Christ in his kingly office as mediator can be found in the Sermons of Rev. Benjamin Morgan Palmer, republished by Sprinkle Publications.)
Presbyterians of all branches and stations would do well to read Plumer / Stevenson on the offices of Christ. These works will help to enrich your understanding of the work that Christ performed and continues to perform to accomplish our redemption.