As other readers have noted, some may have trouble keeping the plot straight. In many ways, the plot is a mess. But loaded with laughs, it is a good mess. As one of the more underrated works of Robert Rankin, it is often overlooked. I would suggest many readers look at it favorably.
Our hero, Russell, starts at the local pub, only to discover that Hitler was not quite defeated and is quite alive in the present day 1990's. Hitler's current elaborate plot for world domination is nothing like the first. Time travel, a flying saucer, and the motion picture industry all play key parts in the plan. Loaded with absurd surprises, it is hard to justify giving away much of the plot in a review. Just when the reader imagines Russell defeated, another door seems to open. There are portions of this book that I must admit gave me weird and disturbing dreams. This is did not take away from my enjoyment of the book. When I regained my equilibrium and sorted the plot, I discovered that I must have enjoyed the book.
I would recommend that readers not spread the reading of this book over a long period. It tends to allow the plot to become a mess in your mind. Since there is no Cliff Notes version, any help in disciphering this book is helpful.