This is a second-hand copy of the book Introduction to Christianity by Cardinal Joseph (Pope Benedict Xvi) Ratzinger.
From the blurb:
In this remarkable elucidation of the Apostles' Creed, Cardinal Ratzinger, former Prefect of the Congregation for the Doctrine of the Faith, now Pope Benedict XVI, gives an excellent, modern interpretation of the foundations of Christianity. This profound treatment of Christianity's basic truths combines a spiritual outlook with a deep knowledge of Scripture and the history of theology. This book is a solid and contemporary discussion of the fundamental Christian mysteries by a highly regarded theologian.