Nursing a secret and hopeless crush on the handsome commuter who passes her booth every day, the charming loner and Chicago "L" ticket seller, Lucy, is about to have a second chance at love. During one seemingly ordinary Christmas shift, Lucy witnesses the object of her desire falling off the platform, and in one of those spur-of-the-moment decisions, she saves him from certain death, only to be mistaken for his fiancée at the hospital. As Lucy enjoys the unexpected stroke of good luck, unable to tell the truth to his welcoming family, unforeseen romantic affairs further complicate matters. Now, the comatose patient's suspicious brother, Jack, thinks he's onto something. Will Lucy face the consequences of what happened while the beautiful stranger was sleeping?