Black Beauty starts showing unusual behavior and Dr. Gordon suspects rabies. After Beauty attacks two men including the new constable, she is ordered destroyed. But Vicky hides her horse, nothing is as it seems and Black Beauty had a good reason for her behavior.

Vicky's friend Colin returns from school and informs her his grandfather's estate is to be auctioned. The young people learn of a family secret that if discovered, may provide the funds to save Colin's heritage. But they are in a race against time.