Cielo “Lo” Valdez doesn’t believe in second chances. Surviving cancer taught her life is too short to spend time on someone who wronged you. But Aidan O’Toole is determined to show her life is best spent together.

When the tough-as-nails Texan moved to Galway for medical school, she wasn’t looking for love. Aidan, a gorgeous, tattooed, mandolin-playing lawyer, slipped past her defenses. They each fell hard and fast. But when Aidan was given the opportunity of a lifetime... to move to London and record an album and he took it, breaking Lo's heart. Yet more than two years and a successful album later, every song he writes is still about her, the one he let get away. And every time Lo hears his voice on the radio singing about love, it’s an arrow straight to her soul.

Now they’re on a collision course as maid of honor and best man at a weekend-long Irish castle wedding. Are some mistakes worth forgiving? Can Aidan convince Lo their song wasn’t meant to end?