Book - - "A Tour of the Summa" by Msgr. Paul J. Glenn
There is no better overview of Catholic theology than the Summa Theologica of St Thomas Aquinas.
"A Tour of the Summa is not a translation, not a digest, not a selection of parts called basic, or best. It is a journey through the entire Summa from beginning to end, and it furnishes a tourist's view of the scope and content of that master work. It is a condensed paraphrase of the essential teaching of the Summa, so presented as to enable the reader to turn instantly to the exact locus in St. Thomas for full treatment of each point discussed . . ."
"The present work holds strictly to the major divisions of the Summa, but omits objections and replies to objections."