ISLAMORADA, Fla. — It's easy to see why bookkeeper Linda Mortimer moved to the Florida Keys 20 years ago: the impossibly blue water, the year-round sunshine, a lifestyle so laid-back that every day is like a Jimmy Buffett lyric. What Mortimer didn't anticipate was falling in love – and then getting divorced less than two years after taking her wedding vows. "I discovered after we got married that my husband had been divorced four times," said Mortimer, as she finished a noontime burger while sitting at the bar at the Ocean View, a local party spot and Mortimer's place of employment. "I was his No.