Two Is Better Than One by Brooke St. James

Summer Stockton was a Grammy Award winning artist and former winner of American Idol. She had been performing on stage since she was a child. She was extremely busy and equally famous, and not at all in a position to fall in love with her temporary bodyguard.
But Miami was just too romantic, and Casey Morgan was completely irresistible. Summer knew it was cliché and unlikely, but there was nothing she could do to stop herself from falling in love.
The problem was, Casey wasn’t a bodyguard at all. He had another job, a very secret job, and he was about to return to it.
Also, Summer had a twin sister, Allie, who was a major part of her life and career.
In a way, this is Allie’s story, too.