I like a good conspiracy theory ... but this book takes it a bit too far. What the author basically does is throw lots of facts at the reader, which (in the author's opinion) seem to point at something dodgy going on in Germany in 1945. The essence is: Himmler wasn't the man who committed suicide when captured by British troops, it was a "Doppelgaenger".
So far, so good - unfortunately some of the most basic facts seem to go haywire, for instance the Munich "Putsch" is misdated. Unfortunately too, a lot of the "facts" seem to be mere impressions. Himmler's nose for instance is made a central indicator for the "Doppelgaenger"-theory, but the author fails to convince me at least that the nose in the photo of the dead Himmler is not the nose in the Party photo. So one by one we are left with few irrefutable facts ... and these do not make a valid base for the wild assumption that Himmler escaped.
The book is inaccurate, mostly based on wild speculation and aimed at the "Last Secrets of the Reich"-readership, which seems to be obsessed with "surviving" Nazis.
Disappointing at least!