This is a book that deals mainly with the history and mechanics of the currency markets, the relationship between the pairs and other instruments, differences in the forex sessions through the 24hr day, types and validity of analysis with a few strategies thrown in.
Very logically written, quite detailed, a bit dry - but it's forex, not Pooh Bear. If you like to know a bit about what's under the bonnet of forex this is for you. As Joe DiNapoli points out (as well as others) - you wouldn't dream of being in any other business without having a thorough knowledge of all aspects of the business, so why would you treat trading differently?
I picked Kathy's book up at the Las Vegas Traders Expo. The book has solid overviews on the foreign exchange market. I even tried out 2 of her strategies recently (the Round number and Fade trade) - good stuff. Worth checking out.