I read this book about 1-Jul-2012. This is the first time I've read this book. The book is copyright 1951. This note was last modified Saturday, 03-May-2014 20:48:12 PDT.
This is book 8 of the "Rick Brant" series.
This note contains spoilers for the book.
China; or nearly Tibet, I think. And treachery, and clever traders, and roving bandits.
And secret caves, under a Buddhist monastery, and a lake full of heavy water. Well, with significant concentrations of heavy water in the lower layers. They finally solve the problem by using explosives to mix the lake.