The content of the book contains an interesting interview and letters to Mr. Roger Goodman in which Herschdorfer-Markstein under his pen name George Markstein claims to be the exclusive originator of The Prisoner TV series, that all scripts were based on his concepts ( although each writer as a matter of record contradicts this) to just mention a few. He further claims that the location of Portmeirion was chosen by him but one contributor states McGoohan was the likely source for the series location, an obvious concession given the well known travel of McGoohan to that location.
Herschdorfer-Markstein's insistence the No.6 is John Drake is represented as part of his claim to have originated the series even though the public records of 1966 show this is not the case.
Two critical claims of the script editor to originating the series seem to to easily dismissable, the claim he chose Portmeirion as the location for the series and that No.6 was John Drake.
Here is an interview with Herschdorfer-Markstein of a similar nature of that in the book.
http://www.the-prisoner-6.freeserve.co.uk/markstein.htm
Jack