An external conflict is that another man is going to die even though he is innocent, and the guilty man refused to confess, and is willing to let him die. Now suddenly he feels guilty and wants to tell the police the other man is innocent. An internal conflict is whether or not he should say something about the other man being innocent. I am not far enough into the book to know how he is going to resolve his problems, but i think because it has been such along time since the trial that it won't make a difference. I think he should confess even if it does not make a difference, because it is the right thing to do.