Holly Russo couldn't be happier. Christmas, her favorite time of year, is only seven weeks away, and her boyfriend has just popped the question. David is steady and reliable, and Holly knows he'll give her a wonderful life. The kind of life she's always wanted. Then her new neighbor moves in. Josh O'Toole is also approaching the festive season with joy. He loves his teaching job. He's about to have a baby with his adored girlfriend, Stephanie, and they've just moved into a new home to begin their life as a family. But as Josh and Stephanie settle into their new house across the road from Holly and David's, things begin to get complicated and soon the Christmas gifts aren't the only things that have to be kept under wrap this holiday season.

William and Donna were born on the same day and in the same hospital, but they couldn't be more different. Will grew up in an affluent suburb and struggles to balance what he wants with what will keep his overbearing mother happy. Donna had a difficult childhood—she was raised by her older sister. She often wonders what her life would be like without her troubled mother around. Throughout their young lives, Will and Donna almost meet many times but it seems fate is keeping them apart. But then everything changes when tragedy strikes them both. As Will tries to come to terms with a life-shattering event, he decides to travel the world in the hope of finding happiness. Donna, feeling alone in the world, makes plans to leave Dublin to follow a dream she never thought she could achieve. More than 10,000 miles away from their homes, fate finally allows them to meet, until a terrible disaster tears them apart once again. They're left with the memory of the brief...