AN UNDERCOVER STORY BRINGS CRIME OUT IN THE OPEN! Frank and Joe's aunt Gertrude leads a pretty quiet life - until an old high school friend turns up in Bayport. Clayton Silvers once had a distinguished career as an investigative reporter. Then he was accused of falsifying some of his articles and even taking money to expose his subjects. Now he's in town, working on the explosive story that he says will be his comeback. Aunt Gertrude staunchly maintains her friend's innocence, but the Hardys