The Mystery of the Moss-Covered Mansion by Carolyn Keene

Nancy teams up with her father, Carson Drew, in this edge-of-your-seat adventure with The Mystery of the Moss-Covered Mansion. It is the 18th book of the Nancy Drew Mystery Story Collection.  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 Mr. Billington could not possibly be guilty of sabotage, Nancy and her father rush to defend the accused man.During the Drew's 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 teenage 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. Book D