I really enjoyed this movie. It was an excellent thriller about a couple's escape with their son to Canada.
The title of the movie refers to the basic source of dramatic tension in the movie. John is planning to break his wife, Lara, out of prison, and has spent some time coming up with a detailed plan on how to do so.
However, he soon learns that Lara is being transferred to another, more secure prison, he realizes his plans aren't going to work. So he has 72 hours -- three days -- to come up with another plan and execute it.
The movie then tells the story of that "next three days" in John and Lara's life.