I bought this book last week while I was in Michigan, and read the whole thing on my flight from Houston to Pittsburgh last night. This is a wonderful translation of St. Ignatius of Antioch's seven letters. Professor Howell begins with several chapters summarizing the life of Ignatius as well as the theological content of his letters.
Martyred during the reign of emperor Trajan (before A.D. 117), St. Ignatius (b. ca. 50 AD) was, along with St. Polycarp (A.D. 69-155), a disciple of St. John the Apostle. So, what you get in this book is a glimpse of the church in its earliest days by someone very close to an Apostle. And what you discover are views of the Eucharist as well as church unity and government that are Catholic, albeit not as developed as what one finds in two or three centuries in the future (but that is also true of Christology and Trinitarian theology). For example, you find in St. Ignatius a view of the Eucharist that connects the denial of the Real Presence (that the bread and wine are the actual body and blood of Christ) with the heresy of Docetism. And you also find a hierarchical view of church government that includes bishops, a presbytery (which was later called "the priesthood"), and a diaconate.
You can get the book here.