It's December, 1999. 28 year-old New Yorker Mark Campbell is an Information Technology consultant, and it's the busiest time of his life because everyone with a computer is worried about the dreaded Y2K bug--so meeting the girl of his dreams at a holiday party is the last thing he needs right now. But that's exactly what happens when he's introduced to Molly Bingham. Unfortunately she's about to marry her obnoxious boyfriend Darren, whom she met in college.
Mark regrets not letting Molly know how he felt before the wedding, but it didn't seem like he had known her long enough. Despite feeling silly about even considering the idea, he seeks out an expert on time travel. Mark is intrigued because the physics professor has been expecting him. It seems these two have met before...
Mark travels back ten years--to 1989--before 18 year-old Molly begins her relationship with Darren. Is it possible for Mark to change their destinies, or is it predetermined? Is there any version of reality where Mark and Molly will be together?