Susan Casey was in her living room when she first saw the great white sharks of the Farallon Islands, just twenty-seven miles off the coast of San Francisco.

In a matter of months, Casey went to the Farallon Islands to join Scot Anderson and Peter Pyle, the two biologists who bunk down during shark season each fall in the island's one habitable building. Two days later, she got her first glimpse of the famous, terrifying jaws up close and she was instantly hooked; her fascination soon yielded to obsession-and an invitation to return for a full season. But as Casey readied herself for the eight-week stint, she had no way of preparing for what she would find among the dangerous, forgotten islands that have banished every campaign for civilization in the past two hundred years.