It's called Touched By An Angel. It's about a man whose wife died in a car crash in 2003. In 2011, he gets a letter that was meant to be given to him on a certain day, and it's in his handwriting. On the way home, he's then stalked by a Weeping Angel, and finally sent back to 1994. He opens the letter to find a lot of money, and a note written by himself with a list of things to do, ending with "remember, you can save her!". It then follows through his life (both past and future him), and stuff. The Doctor, Amy & Rory are all involved as well, of course. They have to follow him to make sure he doesn't change the past (which is what the Angels want to happen. These are special Weeping Angels, that feed on paradoxes). I want them to turn the book into an episode, or at least the idea from the book.