Molly Barlow isn't that girl anymore. A business major at her college in Boston, she's reinvented herself after everything that went down a year ago... After all the people she hurt and the family she tore apart. Slowly, life is getting back to normal. Molly has just said I love you to her new boyfriend, Ian, and they are off on a romantic European vacation together, starting with scenic London. But there on a tube platform, the past catches up to her in the form of Gabe, her ex, traveling on his own parallel vacation with new girlfriend Sadie. After comparing itineraries, Ian ends up extending an invite for Gabe and Sadie to join them on the next leg of their trip, to Ireland. And Molly and Gabe can't bring themselves to tell the truth about who they once were to each other to their new significant others.