It might help you get better recommendations if you clarified what exactly you are interested in.
For example, do you want to know more about the theologies of St. Augustine of Hippo and St. Thomas Aquinas? Do you want to learn more about the various Catholic schools of thought regarding predestination and free will, including those schools called “Thomist” and “Augustinian”? Do you want something exploring what’s sometimes identified as two basic spiritualities or temperments people have, the “Augustinian” being more focused on the will and with a more tragic sense of humanity and the “Thomist” being more focused on the intellect and the goodness of humanity?