What can I say? One of the best roleplaying games of the last years - no doubt about it. If you like the idea of a renaissance setting spiced up with mystical elements then get this book. The Game Master's guide covers, as expected, rules that are needed by the Game Master only (the basic rules are covered in the 7th Sea Player's Guide). But moreover this book gives you an insight into some of the nasty little secrets that you'll find in the world of Thea. The ideas are mindblowing to say the least. It is obvious that the creators invested alot of heartblood into this book (and every other 7th Sea supplement really). The book starts out with a description of the different nations of Thea and will give you a few details about regions, major cities and prominent npcs. You'll find rules for mass combat and naval battles in here, as well as tips how to run a succesful 7th sea game (and I mean really useful tips - not the usual self-evident crap that you will find in so many other games).
[5 of 5 Stars!]