Dead Letter — Betsy Byars / Betsy Cromer Byars

I don't want to die.
He's going to kill me, I know it. He's back! Look inside . . .

When super-sleuth Herculeah Jones discovers a mysterious letter hidden in the lining of a secondhand coat, she knows she's getting a lot more than she bargained for. Could the message be a desperate cry for help from someone in distress? If so, what happened to the person who wrote it? Herculeah is determined to find out.