The two meet via letters left in a mailbox at the lake house they have both lived in at separate points in time; they carry on correspondence over two years, remaining separated by their original difference of two years.This film reunites Reeves and Bullock for the first time since they co-starred in Speed in 1994. Kate Forrester (Sandra Bullock) is leaving a lake house that she has been renting in Madison, Wisconsin to move to Chicago.After a long pause, the mailbox flag finally lowers; Alex has picked up her note.
Rushing to the lake house, Kate frantically writes a letter telling Alex she loves him, but begs him not to try to find her if he loves her back.
Wait two years, she says, and come to the lake house instead.
The railway station in the movie is the real station of Riverside, and the bridge that Alex crosses while chasing Jack is called the "Swinging Bridge"; it crosses the Des Plaines River.
The scene where Kate gets stood-up is in Millennium Park at the Park Grill.
They cautiously look around each time the flag changes, hoping to somehow spot the other. They then discover that they are living exactly two years apart.