The book was the proper length for the evidence put forth, although the final chapters were somewhat repetitive. Excellent description of the JN-25 system. This title belongs on the shelf of any historian interested in the US entry into WWII. That JN-25 had been read by the British had appeared previously, notably in the book "And I Was There" by Admiral Layton and have been ignored by mainstream historians. "Betrayal" forces the reader to reconsider the manipulations of the British whose conduct was clearly cost US lives. Continued British lying and secrecy surrounding the issue indicates that England wishes to wait for the WWII generation to quietly pass from the scene before they come clean.