Institutes of the Christian Religion, 4 volumes by John Calvin:

This 4 Volume in 1 classic by John Calvin covers the basic doctrines of Christianity and theology. 943 Pages.

The following is the chapter list of this book (to name just a few):

GENERAL INDEX OF CHAPTERS
INSTITUTES OF THE CHRISTIAN RELIGION
BOOK FIRST. - OF THE KNOWLEDGE OF GOD THE CREATOR
ARGUMENT
CHAPTER 1. - THE KNOWLEDGE OF GOD AND OF OURSELVES MUTUALLY CONNECTED. NATURE OF THE CONNECTION

CHAPTER 2. - WHAT IT IS TO KNOW GOD,TENDENCY OF THIS KNOWLEDGE

CHAPTER 3. - THE KNOWLEDGE OF GOD NATURALLY IMPLANTED IN THE HUMAN MIND

CHAPTER 4. - THE KNOWLEDGE OF GOD STIFLED OR CORRUPTED, IGNORANTLY OR MALICIOUSLY

CHAPTER 5. - THE KNOWLEDGE OF GOD CONSPICUOUS IN THE CREATION, AND CONTINUAL GOVERNMENT OF THE WORLD

CHAPTER 6. - THE NEED OF SCRIPTURE, AS A GUIDE AND TEACHER, IN COMING TO GOD AS A CREATOR

CHAPTER 7. - THE TESTIMONY OF THE SPIRIT NECESSARY TO GIVE FULL AUTHORITY TO SCRIPTURE. THE IMPIETY OF PRETENDING THAT THE CREDIBILITY OF SCRIPTURE DEPENDS ON THE JUDGMENT OF THE CHURCH..

CHAPTER 8. - THE CREDIBILITY OF SCRIPTURE SUFFICIENTLY PROVED IN SO FAR AS NATURAL REASON ADMITS

CHAPTER 9. - ALL THE PRINCIPLES OF PIETY SUBVERTED BY FANATICS, WHO SUBSTITUTE REVELATIONS FOR SCRIPTURE

CHAPTER 10. - IN SCRIPTURE, THE TRUE GOD OPPOSED, EXCLUSIVELY, TO ALL THE GODS OF THE HEATHEN

CHAPTER 11. - IMPIETY OF ATTRIBUTING A VISIBLE FORM TO GOD.THE SETTING UP OF IDOLS A DEFECTION FROM THE TRUE
GOD

CHAPTER 12. - GOD DISTINGUISHED FROM IDOLS, THAT HE MAY BE THE EXCLUSIVE OBJECT OF WORSHIP

CHAPTER 13. - THE UNITY OF THE DIVINE ESSENCE IN THREE PERSONS TAUGHT, IN SCRIPTURE, FROM THE FOUNDATION OF THE WORLD

CHAPTER 14. - IN THE CREATION OF THE WORLD, AND ALL THINGS IN IT, THE TRUE GOD DISTINGUISHED BY CERTAIN MARKS FROM FICTITIOUS GODS

CHAPTER 15. - STATE IN WHICH MAN WAS CREATED. THE FACULTIES OF THE SOUL THE IMAGE OF GOD FREE WILL ORIGINAL RIGHTEOUSNESS