Euphoria Raindrops

Chris, a 13 year old boy just lost his father. It was an accident. While he thought that he would be always gone and would never see him again, he discovers a box with his name on it under his bed. When he opens it he finds dozens of letters with different times on them, telling him when to open them, but when he finds one that says "The truth behind why I died", he learns a whole new truth about his dead dad he probably would want to forget.