Pipin Ferreras and his wife, Audrey, really loved each other and were really obsessed with the sport of ''no limits'' free diving, in which divers strap themselves to metal sleds and hurtle downward to depths of more than 500 feet below the sea's surface. This, of course, can lead to the worst kind of trouble -- you learn in The Dive, in Chapter 1 that Audrey's last dive was, well, her last. While the writing is self-conscious and the love story saccharine, the book feels honest. The drama and danger of the record-breaking dives keep you on the line. Pipin admirably exposes his own fallibility, suggesting that his competitiveness and stubbornness may have contributed to Audrey's awful end.