The Hardy Boys #178: The Mystery of the Black Rhino by Franklin W. Dixon
Just In Time To Catch A Killer
Frank and Joe Hardy follow their father on a trip to Nairobi for an incredible vacation. Intrigue has a way of finding the Hardys, though, and in a short time they become involved in a dangerous case. Someone's hunting wild animals for prize skins and tusks, angering the area's animal rights activists. When Frank and Joe see some of the horrific work of the hunters while on safari, they become determined to help put an end to it.
This criminal hunt is fierce. The Hardy boys find themselves getting closer to danger than ever before. And after a treacherous hunt for the culprit, imagine their surprise when the Hardys learn that they were never far from the true criminals behind the vicious acts in Kenya....