Dear Luke, let me start by saying that I love you. I never wanted to leave you. Luke Richardson returns home after the funeral of his beloved wife Natalie and now has to raise their three children alone. But there is one thing he is not prepared for: a blue envelope with his wife's handwriting waiting for him on the floor of their house. The letter inside, written by Natalie on the first day of her cancer treatment a year ago, is just the first of many. Luke is convinced that the letters truly come from his wife, but who is delivering them to him? And what about the mysterious man Natalie contacted shortly before her death? Determined, Luke sets out in search of answers and uncovers a dark family secret that makes him question everything he thought he knew about her.