On the Finished Pile:

"Covenant Theology: The Key of Theology in Reformed Thought
and Tradition" by Peter Golding.

Covenant Theology is a combo of a history of the development of
Covenant Theology through the years of church history and a
definition of Covenant Theology itself.

I loved the following quote from Geerhardus Vos that Golding puts
towards the end of the book.

"Only when the believer understands how he has to receive everything
from the Mediator, and how God in no way whatever deals with him
except though Christ, only then does a picture of the glorious
work that God wrought through Christ emerge in his consciousness
and the magnificent idea of grace begin to dominate and form in his
life. For the Reformed, therefore, the entire ordo salutis...is
bound to the mystical union with Christ....Now the basis for this
order lies in none other than in the covenant of salvation with
Christ."