The excitement of finding Queen is quickly gone when it is reported that there has been a robbery of forty thousand dollars in securities and jewels from the Tower Mansion owned by siblings Hurd and Adelia Applegate. Hurd Applegate is convinced that the Tower's caretaker, Henry Robinson, is the guilty party. The Hardys are especially concerned by this accusation, because Henry's son, Perry, is a friend of theirs who will have to quit school to work since his father can no longer get a job as a result of Applegate's accusation. The only "proof" of Henry Robinson's guilt is that he was suddenly able to pay off a debt and refused to reveal where he got the money to do so.
