Moon Over Montego Bay by Jane Graves

Sarah Renfro’s vacation fling with Nick Baxter made her feel like another woman–wildly free and sexually uninhibited. Then reality set in. She left Nick before dawn one morning, flew home, and vowed to put the experience behind her. A year later, she’s in Montego Bay for her dream wedding to a rich, handsome, successful man. Then her fiance’s black-sheep brother shows up. One look at him, and Sarah knows he could blow her wedding plans sky high!
When Nick met Sarah, it was love at first sight, and he was convinced she was his soul mate. When he woke one morning to discover she’d disappeared without a trace, he was devastated, but not nearly as upset as he is a year later to discover that his estranged brother is getting married. To Sarah. In three days.
There’s only one thing Nick can do. He hops a plane to Montego Bay, determined to convince Sarah that his arrogant, obnoxious brother isn’t the right man for her–and he is!