The Mystery of the Moss-Covered Mansion — Carolyn Keene

A friend of Carson Drew's has been arrested and charged with sending a truck loaded with explosive oranges into the Space Center complex at Cape Kennedy. Knowing that Mr. Billington could not possibly be guilty of sabotage, Nancy and her father rush to the defense of the accused man.

During the Drews' investigation Nancy becomes suspicious of an old, spooky mansion. Behind a high, steel-mesh enclosure fierce African wild animals roam over the extensive grounds. Through a ruse the clever teen-age detective discovers that something besides the training of wild animals is going on at the mysterious moss-covered mansion estate.

Many dangerous moments await Nancy before she proves Mr. Billington's innocence and thwarts the plans of treacherous subversives bent on undermining the U. S. space program.