Meredith (voiceover): Every patient's story begins the same way. It starts with them being fine. It starts in the before. They cling to this moment, this memory of being fine. This before. As if talking about it will somehow bring them back. But what they don't realize is that the fact that they're talking about it to us, their doctors, means there's no going back. By the time they see us, they are already in the after.