'There was a story that began—' begins Sabbatical, and the story is then interrupted for two nights and a day by a storm at sea, itself interrupted by a dialogue on Aristotle's distinction between lexis and melos. Like most Post-Modernist fantasies, Sabbatical takes a lot of unpacking. But this is John Barth in a holiday mood, and a virtuoso display of techniques brought together from different kinds of novel is here frankly offered for enjoyment. One of its methods is purely realistic: it is full of information, for instance, about sailing in the Chesapeake Bay…. Sabbatical is as devotedly a novel about sailing as The Riddle of the Sands; and like that rather staid classic it uses a sailing trip to get its crew involved in a real-life mystery story. Where Erskine Childers was writing about the Kaiser's invasion plans, Barth is writing about the CIA. An...