Mystical theology is found in the writings of John of the Cross, Teresa of Avila, Catherine of Siena, etc.  I guess my mind just doesn't work that way (or I don't care to do the work).  As to this book, I'm not sure what it may mean for the whole Church; it rings a bit Congregational to me.  I hope that when you read it you will come back and give your thoughts.  Happy Easter Season.