Unfortunately this is a dry language and memory book macquerading behind the glamour of spying. There is little or nothing to link it to the world of espionage and sadly little of use in terms of language instruction.
I don't think I would buy this as my only source of learning Japanese. For me it was a refresher, and fairly helpful. You won't learn a ton of Japanese, but I do think it's a good starting point and has the most important and useful phrases. It is quirky, and as such I don't think I'd want to listen to it repeatedly like other phrase books are meant to be replayed again and again. But I think if you have a hard time with the standard phrase type options, this would be a good change and will get you started. Then I would switch to the more typical style to get a broader vocabulary. My favorite has been the Instant Immersion, which does a good job of giving you a little more than set phrases over and over again, but can be listened to repeatedly (and is a good value for money).