This book will give you a great insight into why there are only 27 books in the New Testament and no others, covering some of the debate - ancient and modern - as to why other writings (especially the pseudepigrapha) were not included.
As a Christian, this book will boost your confidence in the New Testament (and, to a degree, the Old). If you aren’t, and you approach this with the world view that the writings are debatable and the arguments for the inclusion in the canon of 27 books are spurious, then you will no doubt find the evidence that Edwards presents equally debatable because if you don’t, then your world view is exploded and the alternative conclusion - that the Bible is true and inspired by God, and that that affects your entire thinking - is to be avoided at all costs. Unfortunately the latter means that you will not approach this book with an open mind and so will prefer to stick with the arguments that suit you, no matter how false this book shows them to be.