I am sharing some quotes from the book mentioned above-
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THE MYSTERY
Shoghi Effendi's statement that the Baha'i Plan could be terminated by the appearance of a third Manifestation in the near future. Abdu'l-Baha writes of the Hidden Words #77 which tells us that only the first two Letters of the Revelation of the Greatest Name have appeared.
THE TESTS WE FACE TODAY, AND WHENEVER A NEW MANIFESTATION APPEARS
Tests from God are sometimes so subtle we do not realize we are being tested. People in religious organizations blindly follow their leaders without individual search for truth or understanding. The Bab's prophecy which says Baha'is will reject the Manifestation after Baha'u'llah. The problems we face when our beliefs are contrary to God's Will.
THE APPOINTED INTERPRETER
The reason a Guardian is indispensable to any World Order and the unity of any spiritual community. The spiritual meaning of "oppression".
THE REVELATION OF THE GREATEST NAME -- THE REVELATION IS NOT YET ENDED
Baha'i'llah destroyed hundreds of thousands of His Writings because believers were not yet spiritually ready for them. Baha'u'llah's prophecy about the coming Manifestation Who will appear when mankind is spiritually ready. Only God knows the exact time when a Manifestation will appear.
THE UNITY OF THE MANIFESTATIONS OF GOD
All Manifestations are One, manifesting one Holy Spirit, the "Word" of God, or the "Primal Will". Each Revelation is greater than all previous Revelations. The meaning of the expression that the teachings of one Revelation "overshadow" future Revelations for a certain time. Titles of the three Manifestations of the Revelation of the Greatest Name BHA'
SYMBOLISM IN THE GREATEST NAME, AND IN THE WORDS FOR ONE THOUSAND AND FOR THE LETTER A, IN ARABIC
The Bab represented the Letter "B" and Baha'u'llah the Letter "H" in the Greatest Name. The Letter "A", the third Manifestation, is yet to be revealed. Symbolism of the numerical values in the Greatest Name. Symbolism of the word for one thousand in Arabic, which is ALF, the same word indicating the first letter (a in English) in the Arabic alphabet. The ALF is also transliterated as ALIF.
"SIGNS" OF THE COMING MANIFESTATION IN THE VISIBLE AND INVISIBLE HEAVENS
Abdu'l-Baha speaks of the spiritual and physical oneness of the universe, and the influence of stars and planets. Baha'u'llah speaks of the "stars" that appear in both the invisible and visible heavens prior to the coming of the Manifestations. The three "stars" or planets that are the signs of the three Manifestations of the Revelation of the Greatest Name."
-John Carre, ALIF of the Gretest Name