This looks to be a promising read and a great resource for understanding Aquinas’s philosophical theology from – Oxford University Press (June, 2008 ). Here’s a brief description from the publisher:

This book offers an in-depth examination of what divine simplicity means for Aquinas and how he argues for its claims. Simplicity and other divine predicates are analyzed within the larger metaphysical and semantic framework surrounding Aquinas’s philosophy of God. The work thus goes beyond the issue of simplicity to some of the fundamental tenets of Aquinas’s philosophical theology and his views on divine predication. The author also engages with a variety of Aquinas’s recent commentators, bringing the insights of this great figure to bear on contemporary discussions.

HT: Thomistica.net