His interest in sharks began with childhood visits to Nantucket, Massachusetts, and grew in the mid-Sixties when he read about a fisherman catching a 4,550lb great white off Long Island. "I thought to myself, 'What would happen if one of those came around and wouldn't go away?'" he recalled. By the time the book came out in 1974, it had earned more than $1million including $575,000 for the paperback rights, sales to books clubs and film rights. It sold more than 20 million copies. The film, in which Benchley had a cameo as a reporter, was the first to make more than $100 million and spawned a series of sequels.