Theon Wright should be closer than most to the truth of this enigmatic case. He was a young reporter who covered the Lindbergh case and, according to his book, he uncovered direct connections between Isidore Fisch (linked to Bruno Hauptmann) and members of the Morrow (baby's grandmother's) household. However, the book is a rambling mess, with possibiities hinted at but never set out clearly. The reader is left to infer key connections, probably wrong.
The core of the book depends on the little corpse found four miles from the house not being that of the Lindbergh child. He bases this on a discrepancy between the height on the "missing" poster and the height of the remains found. However, he does not take into account the measurements in a letter from the child's own doctor to the grandmother, eight days before the remains were discovered. Neither does he account for the little shirt found on the body that matched flannel and thread still held by Betty Gow (the shirt's maker).Unless the author has/had very good reason to discount all of this evidence, the book falls down on its key premise.
The book should not be discounted in entirety - it raises some very interesting points about the gang (or gangs) involved in the ransom demands, and it throws a lot of doubt on Hauptmann as a lone kidnapper. The book needs reorganising and a stern editor.