Nice story - shame he loses the plot halfway. For a while it's what Robinson fans have come to expect. Lots of slick writing with cardboard characters (and why not -- characters can afford to be two-dimensional when the action's coming thick and fast).
However, while Robinson starts very well indeed in this his third novel of Big Men Doing Stirring Stuff On The Briny -- he loses it by the end. The only good point is the return of the wonderfully heroic anti-hero Commander Adnam - in my view the only really likeable character in the book. All right he may be a terrorist, he may have blown up lots of hapless air travellers -- but - nobody's perfect! You can't help but like him.
The US characters in the book are strangely unsatisfying, because in this book they have to be particularly slow for Adnam to do what he does. Especially the laughable US admiral -- no I'm sorry, to get to the top of any country's national intelligence agency you need more grey cells than this guy can muster.
Of course I'm over-reacting in one sense. Because you wouldn't read this book for it's subtle delineation of men and women under fire, or how relationships shift and warp under pressure. No you read it for Action - with a capital A.
Trouble is when Robinson stops and has his loveable villain start thinking about the distress and anguish he's caused -- it stops the novel. Dead. I won't give away the final ending, except to say it was anti-climatic and came far too late.
Anti-heroes, like heroes, deserve to go out with a bang, not a whimper. My vote is that when next Mr Robinson writes about submarines -- as I hope he does -- he sticks to slam-bang action.