Given the question: Build a movie plot around this: how was alex killed? in a traffic accident
The answer is:
In 2006, Dr. Kate Forster (Bullock) is leaving a lake house that she has been renting in Madison, Wisconsin to move to Chicago. Kate leaves a note in the mailbox for the next tenant to forward her letters should some slip through the system, further adding that the paint-embedded pawprints on the walkway leading into the house were already there when she arrived.Two years earlier in 2004, Alex Wyler (Reeves), an architect, arrives at the lake house and finds Kate's letter in the mailbox. The house is neglected, with no sign of paw prints anywhere. During the house's restoration, a dog runs through Alex's paint and leaves fresh paw prints right where Kate said they would be. Baffled, Alex writes back, asking how Kate knew about the paw prints since the house was unoccupied until he arrived. On Valentine's Day 2006, Kate witnesses a traffic accident near Daley Plaza and tries to save the male victim, unsuccessfully. She impulsively drives back to the lake house, finds Alex's letter and writes back.Both Alex and Kate continue passing messages to each other via the mailbox, and each watches its flag go up and down as the message leaves and the reply arrives as they wait at the mailbox. They cautiously look around each time the flag changes, hoping to somehow spot the other. It is in vain as they are alone at the mailbox. They then discover that they are living exactly two years apart. Their correspondence takes them through several events, including Alex finding a book, Persuasion, at a train station where Kate said she had lost it, and Alex taking Kate on a walking tour of his favorite places in Chicago via an annotated map that he leaves in the mailbox. Alex eventually meets Kate at a party but he doesn't mention it in their letter relationship to her because she did not "know" him at that time. She did remember the meeting as a vague memory in the past. For Alex, the meeting happened in the Present but for Kate, it had already taken place in the past without her knowing that it was Alex.As Alex and Kate...