Pretty disappointed with this one. The premise of this book is that the US was taken over by the "Pan Asians". The last remaining vestige of the US military consists of a few scientists and an advertising writer. Rather than give up, the ad guy decides to use the time honored military tactic of making up a fake religion and using the newly invented "Ledbetter Effect*" to beat back the yellow menace once and for all.
The book is just absurd wish fulfillment. Utterly goofy and filled with racial pejoratives that might have been acceptable When this book was written, 1941, but is very jarring to read today.
I am a Heinlein fanboy but I would skip this one unless you are a completist. Two stars including one just because I love Heinlein.
*The Ledbetter Effect is the well known scientific effect of using radiation to do whatever the fuck you want. See also Alchemy or Handwavium.