This is a whirlwind tour through 2000 years of Christian history. The text is divided into centuries, and brief synopses of each century are given, with a focus on the major events and people, typically saints and clergy but with many notable laypeople mentioned too. Some of these centuries receive more detailed treatment than others, depending on the extent to which each century saw major conflicts (chiefly doctrinal in the earlier centuries; chiefly administrative in later centuries).
Expect brevity rather than thorough coverage. This is 2000 years of history in 320 pages.
I did find it amusing that the book concludes abruptly with a few short lines about Pope Francis, noting his "simple way of life and his concern for the poor, while also remaining firm in his support of traditional Roman Catholic theological and moral teachings." I suspect that many traditional Catholics today would disagree strongly with this conclusion.