This book is by H S Lewis of the Rosicrucians.
Not a lot of details here, but some interesting points made here and there.
I think the main points of the book are that Jesus had a wider group of intimate disciples than most of us might have thought and that not all of Jesus' teachings were revealed to all - with some biblical basis to support both of these ideas. There are some hints as to why this was so also. In addition, Lewis claims that the Church has complicated, hidden and/or altered Jesus' true teachings in the process of bolstering itself as it developed since the first century - a few examples are given of this.
I don't know that I would run out and get the book if I were you, but it has some points worth reading.