Jen Morrison has always thought of herself as a good person. She is a devoted mom to her son Danny and a dedicated nurse. She feels lucky in so many ways, but she's never been lucky in love. Her husband left her and their son years ago. Since then, he has re-married and started a new family. Jen is focused on her son and career, vowing not to have her heart broken again. But then a new patient is admitted to Sacramento Grace Hospital, and her life is forever changed. He is brought in after a car accident leaves him with a nasty head wound, and without a memory. He doesn't have any type of identification on him, and no one seems to know who he is. They call him the mystery man; he calls himself John. The pair quickly develop feelings for each other, but can their love last when his past comes back for him?