Nichols' stated goal is to leave the reader unsatisfied. That may sound odd, but it makes sense. This book is a brief tour of classic books throughout church history. Nichols intends this book to be an appetizer, leading the reader to delve deeper into church history and classic books. As he admits, he could have selected different authors; he could have profiled John Owen in the Puritan era, but profiled John Bunyan instead.
This book is easy to follow and understand. It is laid out by era. Nichols selects two or three works (including their authors) to profile from each era. Each chapter is about a person and one of their books; sometimes, it's not their most popular work, but one which Nichols feels is important. Then, the chapter has a short biography of the author, an explanation of his thought, a closer look at the book in question, and thoughts on the author's legacy. Each chapter concludes with a selection of sources for further study. The final chapter has a selection of more comprehensive works on church history.
As for Nichols' goal, does he achieve it? He did for me. I've already found a public-domain version of Jonathan Edwards' "History of the Work of Redemption," and I purchased Mark A. Noll's "Turning Points."
Highly recommended.