Christine (Smith) arrives home to her flat with Adam (Riley), whom she has just met at a New Year's party. Thirteen months later, it is
Valentine's Day and Christine chats with her flatmate Fung (Liu) at home. Christine is dating Adam, but receives a card from her first boyfriend, whom she has not seen since childhood. On
Mother's Day, Christine's mother Marion (Dotrice) visits. Marion reveals that Christine's first boyfriend died when he was 16, which Christine had forgotten. Marion urges Christine to marry Adam; Christine's father Ernie (Copley) has
Alzheimer's disease and is deteriorating. The following year, Adam moves in with Christine at
Easter. Christine begins to prepare a surprise for him, but is disturbed when an egg smashes on a nearby wall. In her kitchen, she is approached by an unknown man, the Stranger (Shearsmith) who says "I'm sorry". Christine, now pregnant and married, awakens startled on a May
bank holiday. Adam and Christine struggle to build a cot. Thirteen months later, it is
Father's Day and Adam tends to their son Jack (played variously by Joel Little and Dexter Little) in the night. Christine hears the Stranger's voice through the baby monitor saying "Come on little man, let's get you out of there" and rushes into Jack's room. She sees the cot is empty and believes that Jack has been kidnapped. She calls to Adam, but Adam returns from another room with Jack in his arms. Christine celebrates her 30th birthday thirteen months later. Ernie no longer recognises Christine, while Adam is more interested in his colleague Zara (Ellerby). Marion blindfolds Christine for a game of
blind man's buff, which she insists Christine has played every year on her birthday since she was 6. Christine hears suspicious noises from behind a door and removes her blindfold to step through. Thirteen months later, Adam is packing a case for a family holiday. Ernie has died, and Christine's relationship with Adam is strained. There is another time shift, and, now divorced from Adam, Christine films Jack as he gets ready for his first day of school. Left alone in the flat, Christine is comforted by Ernie as she cries. On
Hallowe'en of the next year, Christine dresses up with her friend Bobby (Pemberton), a colleague at
Clarks. Someone Christine assumes to be Adam enters the flat to pick up Jack. When Adam calls at the door, Christine goes to Jack's room and finds Jack in the arms of the Stranger. On
Bonfire Night, Christine arrives home with Jack, who has burnt his hand on a
sparkler. Marion finds that Jack is not injured, but says that Christine was burnt the same way when she was Jack's age. She pulls her sleeve down to reveal a scar. It is
Christmas, and Christine is having
dinner with Marion, Ernie, Fung, Bobby and Adam. Christine and Adam are back together. Christine unwraps her present to find an album of photos from her life, and then realizes what is happening. She has been dying as a result of a road collision as emergency services attempt to free her while
her memories replay themselves. The Stranger claims to have accidentally stepped onto the road causing the crash. He explains to the police that although he rescued Jack, he could not reach Christine, and that he is sorry. At the dinner table, Jack enters dressed as a
Nativity angel. Marion says it is time for Christine to go. Christine says a final goodbye. ==Analysis==