I've become very suspicious of any book with Chris' name on the cover these days. The publishers are ghost writing so many books these days and Mr Ryan is apparently writing one book a week that you never know if he really did write it.
Fortunately in this case is does not matter. The book is excellent. It's a high action adventure, where a retired SAS man gets roped back into service for one last mission. This old man is such a joy to read. He's cantankerous, unpleasant and self reliant and just such a perfect model of what your hero shouldn't be that he really brings to the book to life.
All in all this book was really fun to read, high adventure in the SAS novel tradition, it even gives an alternate reason for the Gulf 2 conflict!
If you like military adventure then I highly recommend this one.