In Limbo plot
Charlie and Nate are best friends. When Nate takes his own life, Charlie is inconsolable. No one understands why Nate did that, not Charlie, not Nate's wife and not Nate's parents. However, Charlie has a way of finding out. He can ask Nate. Nate's ghost constantly appears to Charlie. Not only can he see Nate, but he can also talk to him.