The Book of Ceremonial Magic by A.E. Waite
Originally called The Book of Black Magic and of Pacts. The Book of Ceremonial Magic by Arthur Edward Waite is an attempt to document many of the famous grimoires, explaing the history behind them and at the same time refuting many of the legends surrounding them. He then goes on to discuss the theology contained within the grimoires and finally goes on to synthesize the many famous grimoires into one complete system.