Deighton is back at the top of the form he handles best and better than almost anyone else around; so is his Funeral in Berlin spy with a new name, Pat Armstrong, and a new job at the Studies Centre where they have very complicated computers and simple edicts like ""All time is game time."" The war game in progress has everything to do with Russian submarine activity along the Northern route and something more specific with a Red Admiral who needs a kidney transplant (none available in the USSR) -- defecting seems better than dying. Firm characterizations along with the ubiquitous Dawlish who keeps turning up at the right time and there's an attractive romance as well. Unlike Le Carre's Tinker, Tailor, Deighton's spy has no time to. reflect and he's involved in a story with lots of equipment from the literally chilling (under the polar pack) scenery and the dialogue with a fast undercut. Imperative entertainment and since all time is game time, get going.