In 2004, Architect Alex Wyler lives in a glass house built on stilts over a lake that was originally built by his father. He finds a letter in the mailbox from Kate Forster, a doctor who will be living in the house in 2006. Somehow they can send letters back and forth, and they soon fall in love.

On Valentine’s Day in 2006, Kate sees a man get killed in downtown Chicago. That night she plans to meet Alex at a restaurant, (a date she made the day before but that Alex made two years earlier). Alex never shows up. Kate figures their relationship is doomed, and she tells Alex to stop writing and give up.
Meanwhile, Alex has met the younger Kate and decides to give up his home for her. He’s crushed when she stops writing. Kate goes back to her old boyfriend, Morgan. But on Valentine’s Day, 2008, she meets Alex’s brother who tells her Alex was killed two years earlier. Kate realizes that Alex is the man she saw killed. She rushes to the mailbox and tells him not to meet her at the restaurant in 2006. He gets the letter (that’s why he didn’t show up), so he doesn’t get killed. He goes to the mailbox in 2008 and finally connects with Kate.

It was slow-moving and somewhat confusing the first time through. I enjoyed it more thinking about it afterwards than I did while I was watching it. The leads were Ok, although I’m not crazy about either of them. I gave it a 6, very close to a 7.

It's rather a slow-moving movie, but compelling. The characters are a little flat, but the concept is cool. I'm pretty sure I wouldn't want to live in the house for more than a month (especially since I saw in the IMDB notes that it doesn't have toilets).