We must go into the sea again. . . the lonely sea sans sky/ And all we need is a good sub. . . sonar to steer her by. The Temeraire is all of that with a fighting British Commander name of Tennant who manages, in the course of this submerged epic, to sink a Russian nuclear submarine, survive depth charges, dismantle a Russian destroyer, keep his crew together after days of being trapped on the bottom and wait out a rescue after an ingenious plan to put his crippled sub together again. All in the interests of a little discreet peacetime spying. In the meantime he has had a very indiscreet affair with his First Lieutenant's wife and this leads to some arbitrarily messy situations and he faces heavy political disapproval at home. It's Patton-ed for a certain audience who will become immersed in the periscopic provocations, not the overall plot.